Wipeout HD got good reviews and for 20 bucks it is priced well. I bet they will charge for the updates, but, 20 bucks is a pretty cheap cost to test if you like it or not. It is supposed to come out next week.
For 20 bucks I bet we could get a bunch of the ps3 owners on Audioholics to do some Audioholics multiplayer wipeout on PSN, maybe even some non-gamers. That would be fun.
Ghostbusters I haven't been following, it was never my thing.