Just finished setting up a new 120L tank (Never had fish before).

I've followed the instructions from several books on how to setup, etc. I'm
at the stage were the tank is full, everything running but no fish (another
3 weeks or so... YAWN)

What are the hardiest fish out there that I should buy to start stocking my
tank?

Thanks

Anyone recommend good/reliable online shops?

Thanks

Clive