I'm finally upgrading my system, and I'm a cheap bastard, so I'm looking for the best bang for my buck as well as good upgradeability (if that's a word). Can someone recommend a good heatsink/fan? I'm planning on starting with an XP 2100+, but I'm likely going to upgrade later, so I'm wondering if it's no biggie to keep the same heatsink/fan with the new proc down the road, are they a pain to stick on a new cpu, and do I need to keep in mind what I might upgrade to in the future when I get the hs/f in the first place? I'm guessing you need more robust ones for the higher speed cpus, yes?