That would be a killer setup for WinUAE. Plenty fast.
One thing I would consider however (if your friend hasn't already bought the processor) would be to go for
this instead of the
Sempron, it will be faster becasue of the larger cache and clockspeed (and as you can see there's no price difference!).
If you want to play with overclocking a little, I would suggest an
Athlon Mobile. This one is likely your best bet, once again similar clockspeed at the same price, and very easy to overclock due to the unlocked multipliers. The default FSB speed is slower, but (with adequate cooling) they will overclock easily to 400 MHz (DDR). If you don't want to bother with all that, I'd stick with the Athlon XP 2500+, which is a great choice IMHO.
-edit- Another thing to consider...for just a bit more cash, you can get an n-force2 motherboard with nicer specs (ability to run 400 MHz DDR, better onboard video/etc..). If this is an option for you, let us know and we'd be more than happy to steer ya in the right direction.
Cheers
:pint:
