You'll also be missing networking but sounds like that's not an issue for you. The 1910 gives you 7 channels (vs 5 on the 1613), more power, and the same version of Audyssey (basic MultEQ). There are a couple of other things missing -- for example the 1910 cannot do an on-screen GUI overlay for the menu graphics, and it doesn't have HDMI 1.4 so no ARC -- but they are minor things that you may or may not miss. On the other hand, the 1910 has a lot more inputs and does analog>digital video conversion which the 1613 lacks (it's basically just an HDMI switchbox).
For $100 it's a great deal, jump on it.
Thanks for the info. Without ARC I'll have to run an optical cable from my PC to Receiver (I guess from everything like Xbox and Playstation), since HDMI wont have audio?