For me, I have always used HP printers with my various Macs, they are plug and play, give excellent prints, and also, if you are using Tiger, you can really see what the printer can do, rather than what windows restricts it to do.
If its A4, then go with a Deskjet 990 ( or whatever the latest model is)
But if you can fit it in, for about £ 150 (or less) get yourself a Deskjet 1220C - dont worry about the more expensive post script option unless you are into creating brochures!
The 1220C, is A4 + A3 and A3+(jumbo size paper) and will print to an excellent resolution.
Try Staples if you want a good deal, they go out of their way to beat PC world!
Hope this helps