Whatever your budget, you can never go wrong with this system :
Thunderbird or Coppermine
Appropriate Motherboard with FSB266
512 megs of RAM PC-133 (hell, go for more if you can)
Cambridge sound system (surround sound)
DTI Virtual Window holographic monitor
Geforce 3 (OR GF2 Ultra DDR 64megs)
70 Gig HDD
*droolz*
http://www.evil3d.net/reviews/dti_vw/index.shtml <--- Go ahead boys.. go drool over this baby !