I was in the same boat somewhat recently and was looking to trade my modded wii + a bunch of accessories for a PS3 as well. My wii collects dust and there aren't too many games coming out that I care for.
But then I saw this deal here and now that my visa came today, I'm going to purchase one at the Sony Store:
http://forums.anandtech.com/me...=2081072&enterthread=y
$350 for a 60gb PS3 + 5 Bluray movies - that's a good deal.
However keep in mind the PS3 isn't that great right now game wise. But I know I will eventually want to get one and I would rather get one right now because after the 60Gb are gone, there will be no more with the EE chip in them so the PS2 library won't be as compatible with the newer ones. Here are a few other things, other than just PS3 games, that I am going to use my PS3 for currently until more games come out.
- BluRay player - I don't have any HD movie player so this will be a neat addition.
- Upconverting DVD player - I currently use my Xbox360 as my primary DVD player, so now I can use this and will have better quality.
- HDMI input - My Xbox360 doesn't have HDMI output on it but my TV does, so now I can finally use that slot onmy TV and see if it really makes a big difference or not.
- PSN - I'm really REALLY looking forward to playing Mortal Kombat 2 online
So yah, that's why I'm going to be getting one

I'm just going to hang onto my Wii though and see how the next few months are game wise and if I like mario, metroid, etc, then I'll end up keeping it. Otherwise I'll sell it.
Oh I also already have an Xbox360. If I didn't have a PS3 though, I'd be getting an Xbox360 over the PS3 no questions asked.