I've been out of the hardware circuit for a while and I'm now looking into at least doubling the processing power of my current computer.

I have a Tbird 800 w/512 133 Ram and an Asus MB (the model number escapes me). I'm looking at the AMD XP1800+, what motherboard should I pair it with? MSI, Asus, Abit? What chipset? Via, Sis, AMD? What about the memory? Can I keep my PC-133 memory or will I have to upgrade to DDR? I understand the degraded performance, but if I need to spread this out across a couple paychecks, that MB and CPU aren't going to be sitting around. I guess I'll also have to upgrade my PSU.

I would be reading up on this myself, but so much has changed in a year and I'm hopelessly behind. There is no way I could catch up, so I need a crash course on technology evolution to this point. Thanks. I know I'm asking a lot, but I'll really appreciate the help.