I believe the 709 is the cheapest AVR you can get with both preouts and XT, so that's the one I would pick. The best part about going with a lower priced AVR is you wont feel bad in a few years when you want to upgrade again. Add the 3 or 5 year extended warranty from A4less and you'd be covered.
http://www.accessories4less.com/make-a-store/item/ONKTXNR709/Onkyo-TX-NR709-7.2-Channel-3-D-Ready-Network-A/V-Receiver/1.html#!warranties
http://www.accessories4less.com/make-a-store/item/ONKTXNR709/Onkyo-TX-NR709-7.2-Channel-3-D-Ready-Network-A/V-Receiver/1.html#!warranties