My suggestions,
Well I am not going to harp on the stability. But that is a strong argument for Intel chipsets. You wont have the problems that are inherent with via 4in1's. Compatiblity, just like MS is the king, Intel is also to a certain extent. So everyone that is making new hardware and software make sure for the most part that it will be compatible with intel/ms.
Overclocking- Most good intel motherboards allow you to lock the pci/agp. By doing this, you dont have to worry about your pci/agp running out of spec and hindering you from you OC. If you go with single channel DDR you can run it async and get more out of your DDR. Next year we will see DCDDR boards in earnest. You will see Rambus performance out of 2 sticks of DDR then. I realize that the early tests of DCDDR for AMD has been lack luster, but you have to remember, Intels were built for the higher memory bandwidth, it has the quad pipe for the memory. You will see a bigger benefit using DCDDR with Intel over AMD.
As stated above, you should easily get 2.7 out of a 1.8 with air cooling, and probally more. Running your DDR in async you will be running it at 200mhz, or DDR400. All the while your PCI/AGP are locked at stock speeds, or upped a little to what you want them at. Your temps will not be as much of a concern as what you have to deal with on an AMD rig. Also when DCDDR is out all the way, you can get a new MB and drop the chip and another stick of identical memory in it, and watch your memory bandwidth increase. I know for a fact that alot of todays games rely heavily on memory bandwidth. In the end the choice is yours, I think you would be happy with a PIV. I have an old palo 1700xp that I am waiting to find a new case and hard drive for to get it back up. But that is on the bottom of my to do list, I have bigger fish to fry!!!
Good luck on your choice what ever it may be.
Buzzdog