If you plan to shoot a lot of 3d you can add 2-4 or 6 power lenses with a HHA sight.Which work out pretty well at the range.

This looks like a good long range one pin adjustable sight..My buddy uses these they are on this site, they went to Montana this year and shot Elk and Mule Deer..
http://www.dantonara.com/

If you are looking to get a single pin sight, HHA has a selection of very nice single pin sights that are super, super bright. They are in the price range you mentioned and IMO are the best single pin sights. I am partial to truglo multi pin sights, but you would do yourself a disservice not to check out HHA. Good luck with the decision.

I've also been using the 5519 HHA for several years now from hunting antelope, whitetail, turkey and elk, and I won't go back to muliple pins.
SIngle pins aren't for everybody, and just like anything else, ya need to practice with it and know your equipment. HHA is quality too.

HHA all the way for single pin!!!

Agreed!
 

Exactly what I did, I don't have a shot over 35 yards anyway, don't like the messy sight picture that multiple pins present.

IMO to use a one pin sight, you should be shooting a faster bow.