I would go with MSI, they are a larger company and have been around for years. They are very respectable and almost always provide compatible and reliable hardware.
I have used MSI for years and had no problems, my System 2 below uses a MSI K7N2 motherboard with a 128MB MSI Ti4200.
__________________ [size=0.5]Full Aluminium ThermalTake Case
Asus A7N8X-E-Deluxe
AMD Athlon XP 3200+ *400 FSB* Barton (2.2GHz)
ThermalTake Volcano 11+ Xaser Edition Air Cooling
1024MB Corsair TwinX XMS 3200 (Dual Channel 2x512) 2-3-2-6
256Mb XFX 7800 GS EXTREME 2x WD Raptors (10krpm 8MB Cache) 36.7GB using RAID -0
Video Logic SonicXplosion 5.1 Soundcard[/size]
Which MOBO? Abit or MSI? Your opinion plz!... 
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