Both the 1712 and the 2112 have MultEq XT which us a pretty sophisticated room-correction system and will EQ the sub (many budget receivers won't eq the sub). The room correct software will impact the sound more than anything else, IMO. The 2112 has a street price of around $450 right now, and you get a pretty nice receiver for the money.
Here is a link that will help with where to find the best prices from authorized online resellers:
Easy : Onkyo HT-RC370 which, for less than $500, will give you 7.2 channels with plenty of power, Audyssey MultEQ XT, Marvell Qdeo 4K full video processing chip, THX certification, WIFI, IPod connection, etc, etc....Truly a bargain in today's A/V world.
I would strongly recommend looking into the HK AVR 3600. Can be had for $545 @ Amazon.com. HK is widely believed to be the best sounding receiver brand. I upgraded from a Yamaha, and the difference in sound is astounding.