I would suggest a Macally iMedia keyboard. I've bought one and I absoluetly love it. It has "springy" keys which makes it really easy to type, flows very nicely. Plus, it's translucent so it'll match any G4/G3/Cube/Imac or whatever.
It also has multimedia keys at the top. 5 miscellaneous programmable keys, and 3 other programmable keys with an eMail, WWW, and "i" logo. The other keys are for operating DVD/CD-ROM and your Audio.
It is a full extended keyboard with T-arrows, number pad, all 15 Fkeys, etc. It's a really great keyboard.
I also bought a Macally 3 button USB mouse. They say it's "PC only" but you can use USB overdrive and it works perfectly.