I use a Logitech MX 900 w/ my 8790 and I absolutely love the wireless aspect. Was a true-blue MS Intellimouse man for many years, so I was hesitant to try out a spendy new Logitech (cost $100 over here in Japan vs $50 in the States). But once I did, it's a matter of never going back. Absolutely fantastic.
As for Newegg, I don't think you're going to find much bad to say about them. I'll echo the others' comments that you probably won't find a better, more reliable site to purchase parts from. Also, I think mwave.com is a sister site. I've also ordered from them a few times.