My computer is too slow -- 1.47GHz processor with only 768MB of RAM and a (gasp) 1x AGP card. You didn't know those still existed, did you?

No, it isn't dramatically slow. In fact, it's quick enough for _most_ stuff. But I can't play half-life, not that I have time for it anyway. So I'm looking at upgrade paths.
1 - Whole new machine -- just replace everything, drives an' all. Then I have two whole computers, one of which is just taking up space, because, in all reality, I will be too lazy to persuade any useful work out of a second machine.
2 - Barebones new machine -- find a deal on a hot little bare bones machine (ebay? PriceScan? Local newspaper?), transfer my drives from one machine to the other, and junk the "old" machine.
3 - Laptop -- Given that I'll be moving in October to a hotel in Connecticut, and living in said hotel for 6 months before going back to a submarine, a laptop almost might make sense. It's also a lot more expensive.
4 - Wait -- just hold off, continue to not play half-life, settle for mediocrity ... until October -- then use my nuke bonus and the fact that I have no debt to get the hottest laptop money can buy!
Thoughts? Opinions? Random ideas? Death threats? Cries of rage? Thanks in advance,
Dan