Which model should I purchase?

I'm also a big Peridise fan. If you like the Peridise so much, I really recommend the Eupho, which is by far my favorite model. 

Size wise it has all the advantages of the Peridise, it's very manageable without a lot of preparation, super comfortable, and if you like the plastic material (or want to use silicon lube), I'd go with that too. It's often advertised as being a more advanced model but since you seem to be a natural with the Peridise, I'm sure it would be great for you.

You'll probably get a lot of recommendations for the Helix, and frankly you can't go wrong with it either, it's more aggressive on the prostate (in a good way) and more filing. So I'd say either Helix or Eupho, but I see you more as a "Team Eupho" guy. Happy shopping !

You just can't go wrong with the Eupho Trident. I have the EST and the shape and "spring" to the tabs are just down right genius...you just have to scratch your head and wonder how the designers came up with it! 

They're on such a great deal this weekend, why not buy more than one? I'm seriously looking at getting a Eupho Trident, Helix Trident, and maximus Trident. All non Syn models for reasons mentioned above. I like silicone lube, easier cleanup, and that everything clings to the silicone after you clean it...lint from a towel or pocket fuzz. Not a problem if you rinse it off right before you lube it, but if you don't have a sacred place for storage...it's an extra step. I love the white plastic of my older MGX and Helix. Clean and can be polished if it ever gets scratched 

I have to clarify, I love the way the syn models feel, mainly because I like the touch of the tabs, but as of yet, I have never owned one of the white plastic Trident models. I suspect there won't be a lot of difference in the feel, maybe others can share that experience.

Posted by: @regal13

They're on such a great deal this weekend, why not buy more than one?

Yes get two toys, that's a great idea since pretty much everything is 30% off, plus you'd qualify for free shipping!  Now is the best time to dive in headfirst.  Heck, you could buy two Trident models and also get the Progasm Red Ice to save for later, considering it's only going to be $24...

Posted by: @zentai

You'll probably get a lot of recommendations for the Helix, and frankly you can't go wrong with it either, it's more aggressive on the prostate (in a good way) and more filing. So I'd say either Helix or Eupho, but I see you more as a "Team Eupho" guy. Happy shopping !

It's not a bad idea, the Helix is great: just look at my profile pic, I love my Helix Syn Trident.  The Helix and Eupho could be a great way to start off, or there's the MGX which is also marketed as a beginner model.  I can't say that I've got as much from the Eupho yet though I've only had it since March or so; it has a unique motion which is subtle, I'm sure with time I will come to love it, but so far it's the Helix that I use most often and from which I get the most consistent results.  Whether that will mean you have success with it I don't know, but it is the only model recommended for all users from beginning to advanced. 

Posted by: @regal13

I have to clarify, I love the way the syn models feel, mainly because I like the touch of the tabs, but as of yet, I have never owned one of the white plastic Trident models. I suspect there won't be a lot of difference in the feel, maybe others can share that experience.

I love the silicone models too, and they're so luxurious and comfortable and until recently that was all I had, Helix, MGX, and Eupho, all Syn Tridents.  I could wear the Helix or Eupho for hours and hours with no discomfort, I've even slept with them in.  The springiness of the arms was something that I took for granted, in fact when I was a bit less experienced I used to complain that I wasn't getting enough contact from the tabs but my perspective has changed. And I think with the Eupho especially they give it have a sort of thrusting/stroking motion whereas you watch the videos and diagrams it's sort of pivoted tapping that the original design intended. 

I don't have experience with the regular plastic models but I just got the Progasm Jr. and man the tabs on that thing bite.  I've only had a couple sessions with it so far (and the results have been spectacular) but I'm still getting used to it; I'd say that the sensation is...salience, to the point of discomfort.  I've had enough after an hour or less; that said I think the hard plastic model has helped me make greater strides in a shorter time period.  Of course, you could get one hard plastic and one silicone to compare/contrast.  The possibilities are ENDLESS.  (insert wink here)