An A64 system would perform better, for not much more. Obviously that's entirely up to you though, if the added price is worth it.
A XP-M + NF7 V2 is especially great for overclocking, if that's your bag btw.
If you're not remotely concerned about Overclocking you could save some more $ by buying a non-mobile 2500+ as well.
If you really just want an internet & media PC then a Sempron would be good enough (hell, a 1.2Ghz PIII or something would do ).. So don't get too hung up on performance numbers. Don't be tempted to get a better processor if it means gettting less RAM or a slower/smaller Hard drive, for instance.
"Sex without love is an empty experience...
But as empty experiences go, it's one of the best" - Woody Allen
I have two systems with that combo. One a NF7 rev 2 and one a NF7-S rev 2. The two mobile XP2500+'s do 2.4GHz and 2.6GHz, but I usually run them slower to be able to lower voltages and decrease fan speed (noise). Great combo. Not up to A64 specs, but if you have the mobo, a XP-M is the way to go. XP3200+ speeds (2.2GHz) will be easy to obtain and most likely at default XP3200+ voltage (1.65v). Boost the voltage and bump up that multiplier and most likely 2.4 GHz will be possible, and maybe more.