Look at the regular Asus GeForce 3. It's like $70 nowadays and it's pretty okay. It'll certainly be leaps and bounds above your GF2, but... it's not really "current" either. Ti4200 is a good buy, but it's also not top of the line, obviously. But it'll run what you want it to run, I think.
As you know, you can put together a system stupidly cheap (witness Sycamore's computer). That's not as fast as you maybe want, but I dunno; if you just want a second computer, it might be perfect. Nothing wrong with the system we designed for him, except you'd want faster video. That also gets you awesome sound and built in ethernet. But it lacks USB 2.0.
I guess, let's talk more about exactly what you want, and then we can design around it. The sweet spot for good computers these days is about $1,000, meaning you don't really have to skimp on anything. Obviously you can build for any cost, but you'll have to give up certain things. You might want to take a look at the "New Gaming Box" thread (I think that's what it was titled); I was undergoing a similar (sorta) project last fall before the fire (and wound up with the current beast of a machine that cost about $3,400). I had a great gaming system priced out for about $1,200, if I recall correctly, and that included a $350 video card, fast P4, expensive case and a high-end motherboard. Prices have fallen, and you probably don't want all that, so...
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