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Question: Optoma HD20 vs. Sony Bravia VPL-HW15

Looking at the reviews on your website, I've narrowed my choices down to the Optoma HD20 (cheap...ranked #6...great reviews) and the Sony Bravia VPL-HW15(ranked #2..decently priced for a Sony) My main concern would have to do with having my theater in a partially lit basement. I can't get all of the natural light blocked, but it's not real drastic. From what the specs read the Optoma actually has more lumens (1700) than the Sony (1000). Does that make my decision sway towards the Optoma? Or is there an option out there you'd recommend? Thanks