I also suggest you sell your Wii.
Go to Swapmagic.com, get some Swap Magic discs, and a flip top case for a used fat PS2. no mod chip or slide card required.
As for a game, there are two ways you could go.
1) An older style like 7th. Good song list, has some classics. Going to have a larger amount of easy songs (easy on Light7/Normal, that is) than newer styles, but with good room for improvement. A bit on the ugly side, but definitely better looking that Beatmania US.
2) A newer style like Gold. Looks really sharp and flashy, great song list. In my opinion, the easier songs in Gold are more accessible/manageable than those in Red, HS, DD, and DJT. If you already have some proficiency in IIDX, it's great start. Gold isn't my favorite mix, but if you're getting into the swing of things, I definitely recommend it. The only thing I'd warn about is...well, getting discouraged by the few REALLY easy songs newer styles offer. It's typically like "Okay, here's a 1*. And a 2*. And two 3*s. HOPE YOU ENJOY THE LEARNING CURVE"
__________________
------------------------------------------------------  |