From what I can remember, the VX oil capacity lists at 5.5 qts, but I buy the 5 qt jugs of Mobil 1 SuperSyn from Wal-Mart, dump that in, and the level always checks out good, so if you're doing a simple drain-and-fill (no flush) it should be fine that way.
I actually just got back from buying oil and a filter myself. I am partial to the FRAM XG3593A (silver canister, orange lid). It's also the ONLY FRAM filter I'd buy, because it's the only FRAM filter that uses metal end caps instead of cardboard in its internal construction.
The K&N's are constructed really well otherwise, but the filtering media isn't so hot and that's the whole point. They actually have about the lowest pass-thru efficiency I've seen out there (only 90% versus 96-99% for everything else). And they cost the most. Love their air filter though.
Wix is a good one oil filter too - if you buy an oil filter at NAPA, it's a Wix.
I had a problem with an oil filter wrench not being quite small enough and borrowed one of my Dad's rubber strap wrenches and it worked great (for oil filters at least)! I always hand-tighten the new one on, though, for reason thedutchguy mentioned.