The only computers that I've had that don't screw up within a month of getting them is the ones I've built and Alienware.
Ok. I'd say build your own or buy the parts and build it. It's a lot cheaper because if you already have a good whatever in a computer you currently own, you don't really need that extra part they add which costs money. But if you'd rather buy, I suggest :
Alienware Desktop Computer
When custom built with :
Warranty - 90-Day AlienCare Toll-Free 24/7 Phone Support
Operating System - Microsoft® Windows® XP Home Edition with Service Pack 2
Alien Respawn - None (thats what a good reformat is for..)
Chassis - Alienware® Bot Chassis with 270 Watt Ultra-Quiet Power Supply - Silver/Black
Processor - Intel® Pentium® 4 Processor 530J w/ HT Technology 3.0GHz 800MHz FSB 1MB Cache
Motherboard - Alienware® PCI Express Motherboard with Intel® 915 Chipset
Memory - 1GB Alienware® Dual Channel Low-Latency DDR PC-3200 at 400MHz - 2 x 512MB
Graphics Processor - ATI RADEON™ X300 PCI Express 128MB DDR w/Digital and TV Out
TV Tuner - None
Media Center Extenders - None
System Drive - 160GB Serial ATA 7,200 RPM w/8MB Cache
Optical Drive - Lite-On® 16x DVD-ROM Drive with Software DVD Decoder
Blank Media - None
Removable Storage - 3.5" 1.44 MB Floppy Disk Drive - Black
Sound Card - Intel® High-Definition Audio (24-bit, 192Khz) with 5.1 surround sound
Network Connections - Integrated High Performance Intel® 10/1000 Ethernet Adapter
It's $855 ($32 a month) for all of that. Which if you have a keyboard and a mouse already, it can cut off some money. The stuff past page 1 of configuring is up to you. That's a pretty good computer for under $900. Would run FFXI and pretty much any game smoothly as long as you take care of it. I do disk defragmenter, disk cleaner, trojan hunter, and anti-spyware on all of my computers once a week and they run as smooth as when I got/built them.