I need to run this application for my graduate work. For those too lazy to click the link, it is a suite of GIS software (somewhat related to CAD with a healthy dose of database). I already have a PC, but it is very minimalist - a socket 775 with a Celeron D 326. It works fine for my current very basic needs but if I need to run the GIS software on it I will need a P4. I may end up getting a MacBook Pro and doing the dual-boot thing depending on how much driver support the Mac hardware attains under Windows. I'll be getting a MacBook either way but if the dual-boot doesn't work out for me I'll still need my PC - RAM and video card are fine but I need to get that Celeron outta there. I was thinking about getting a 3.0-3.2GHz Prescott P4...any other suggestions? Price isn't necessarily a huge issue but I'll probably only need to run the software for two years or so, after which I'll hit another Blackadder Hardware Upgrade cycle and get a new desktop machine (which by then will hopefully be a maxed-out Mac tower with Leopard, Linux and Vista triple-booting... ).