I currently have Intel.. last system was AMD.. lemme just say NOW more than ever it's important to justify a purchase/build with answering a couple of basic questions FIRST: What kinds of budget(da moola) do you have? SECOND: What apps do you intend to run on the machine? You can base this answer on the most DEMANDING apps you might throw at it.. ie GAMING, MULTITASKING, DISC BURNING, MULTIMEDIA Storage, HD video playback/recording encoding, Very high speed internet, etc. You can get away with a build under $350 from soup to nuts (dvd burner, no blu ray for you elcheapos).
Here's my idea.. for systems costing $350 and under (soup to nuts-- or gut rebuilds you can probably get away with AMD).. from $350 and up you'll probably kick yourself for not going with Intel..
Of course this is a generalization, and YMMV since computer part prices vary throughout the year and could depend on what you have from your last build to stack the deck for one build vs another.. Almost nothing could be used from my last build.. my old AMD was a single core, the PSU was useless since PCIE bus, the MOBO power supplies needed 24+4 +4//8pin connectors for video cards.. etc.. So the build ended up depocketing me for about $650-$700 (in 2010).