Let's take these head to head comparasion, design, futuristic, compatibility, features appeal and ofcourse price & availability.
Asus 8800GT : Newegg.com - ASUS EN8800GT/G/HTDP/512M GeForce 8800GT 512MB 256-bit GDDR3 PCI Express 2.0 HDCP Ready SLI Supported Video Card - Retail
Sapphire 3850 ...