1.) If you’re waiting for few moths then the FX-55 will be out. If you want to wait a year, dual core FX-es will be out. I personally would wait for the 55, because I am pretty sure they will be based on the 90 nanometer process, which will mean better over clocking. And is generally faster then the 130 form. I could never wait a year with out upgrading.
2.) I would change to a different hard drive. Maxtor will be releasing their Maxline III at In August and they are comparable to the Raptors. Plus they have NCQ which will be a big benefit once controllers support it. Of course you could also go with the Hard drive king, the 74Gb raptor. It’s the fastest sata/ide hard drive you can buy.
3.) Drop plextor and go with liteon. I have use liteon for years with very little problems. High quality, better price, same benefits. Newegg has your plextor drive for 150, but has the same everything liteon drive for 91. Save some money and go with the liteon. You will not be disappointed and you loose nothing. On another note I am pretty sure liteon is the more popular and use Burner brand. Even sony uses them, but calls them something else. Plus there are tons of hacks, and tools that will allow you get the most out of your drive. I just bought his same burner and according to a group that makes the tools to mod liteon drives, they say that the drive should be able to burn (yes I said burn), dual layers. Buts its still in testing stage, but the results are something to be noticed.
Main System Specs
AMD Athlon64 3200
Asus K8V SE Deluxe
ATI Radeon 9800XT
Kingston Hyperx 1GB