What is the best Aneros for milking the prostate for chronic

I looked through the forums where it talked about when you should do milking and when you shouldn't (something to do with bacterial vs non-bacterial).

Either way, I have to go to my doctor twice a week to do the milking, for 2 months, and pay 35 dollars each visit, not withstanding that it takes me 1.5 hours to get there.

So which Aneros is best for me?

Things you need to know / teach me:

[1] I will be doing this almost everyday. Do you think having one with a wide diameter all over would not be a good idea because it would stretch my rectum too much?

[2] Do you think it would be good if i get a big head because that way it will be easier to massage the prostate?

[3] Which Aneros has a flat head instead of a pointy one?

Thanks