My main shooting buddies will absolutely not shut up about how "impractical" of a deer rifle my 20 inch AR-10 (308) with 5-30x scope is.
If I had a desire to kill a deer with it, that deer would DIE. But, uh, not exactly the point.
(Edit to elaborate/clarify: I don't have any particular desire to hunt, so I am annoyed that my friends insist on discussing the suitability of my long distance precision target rifle for hunting. That said, if I indeed did desire to hunt with it, it would be more than adequate for the task)
A lot, and A LOT; but it was a high end custom build because I wanted pretty. You can find one below 1k from PSA, I think.
In my opinion, more guns more fun, so I'd say shorty and longboi. Short AR-15s are absolutely fun.