How's your PC? If you get a good PC, you can probably put off buying 360 at the moment. (If and only if you are willing to wait for usually not that good PC ports, since everything except Blue Dragon will be on PC, if either already or sometime in the future)
On the other hand, considering you can't buy most 360 games due to parent restrictions, Wii + DS +VC looks like a much better option, however RE4 is a M rated game, and should be cheaper unless than your listed price unless you live in Europe.
I am a PC gamer, and also have a NDS now, but without access to a Nintendo Wii until End of 2007.
Currently playing: Super Smash Brothers Brawl(Wii), Mystery Dungeon: Shiren the Wanderer(DS), Dragon Quest Heroes: Rocket Slime (DS), WiiFit(Wii)
Games Recently Beaten: Final Fantasy Crystal Chronicles: My Life as a King (Normal; Very Hard after the next DLCs become available)
1 word: RTFA
