It's hard to say wether it's worth the wait for you. The first Athlon 64 that will be released will probably be a 3400+ version, so I guess that one will compete with the P4 @ 3,2 Ghz.
If you want to buy a new system with a mainboard that can be used for upgrading up to 2 years, you'd better wait for the Athlon 64 to arrive.
If you really are in need of a new system now (your current system is perfect for office use, but not for modern games) I'd suggest to buy a descent system right now and keep it for a year or so.
If you are into overclocking, you can get good performance for a reasonable price (I bought a NForce2 based mainboard, an Athlon 2100+ -Tbred B- and overclocked it to 2700+)....