I have GTA3 and Vice City on the PC too and I will say that I do like the mouse for aiming (the PS2 analogue controllers suck in this regard) and have higher resolutions, etc, but I'd rather play the game sitting back in my armchair than hunched up over a keyboard
The Xbox seems to be the perfect solution, great graphics, decent controllers and I get to use my widescreen TV
After all, they are originally console games.