I have an 8150 and I like it. It reduced my rendering time in handbrake tremendously. If I had to do it over, I would go for the 8120. Its cheaper and you would be able to overclock this chip to the same speed as the 8150 very easily. Newegg has them on sale for $160 right now with code EMCNENF24.
HT Set-up: Yamaha RX-A2060; Ascend Acoustics LCR and Luna surrounds; Rythmik LV12R
Desktop Set-up: Yamaha RX-A730; Ascend Acoustics Luna's; Polk TL1 Center; Rythmik L12