recommended PSU for a1200T

[nasty]

I'm having afew issues with my setup (sig) and I think it is down to the PSU, so can anyone recommend a good PSU for my setup?

or simply tell me what I'm looking for in a PSU (I  know amps are important but what size should they be?)

I was looking at this but it doesnt say much about amps
AmigaKIT  PSU

Thanks in advance for any help  :-D