If you plan on using the sight only for target, I would personally recommend a slider type sight (i.e., Sure-Loc, Axcell, CBE, etc...) I believe you would be much better of/happier in teh long run with a sight bar like that. Dont get me wrong, the HHA's are nice and many use them, but if you are just going for target setup, you could get a better setup than the HHA... depending on how much you want to spend of course.
heres a pic of my 9"Sure-Loc Supreme400 sight bar, with my Viper 4x scope with a .010 up pin.



The Carter EVO+ is a very unique release. Some like it, others dont. How familiar are you with BackTension shooting? Anyways, the EVO is about the most true release made, adn in the right hands can be shot with very well. Ive never used one, but id like to. Ive heard they take quite a bit of practice to master, but any type of BT release does.

BTW, you can find great deals on EVO's on AT...
Derek