Need help picking a 46 inch 1080p LCD TV?

I am shopping for a 46 inch 1080p LCD TV but there are so many similar ones by different companies (e.g. Toshiba, Samsung, Sharp, LG). What brand TV should I get? Also, the 120Hz TVs are all about $300-$400 more than the 60Hz ones. Is it worth spending the extra $300-$400 for this? At this point I am debating getting the "Toshiba Regza 46 inch 1080p 120Hz Flat-Panel LCD HDTV (46LX177)" because an employee at the Best Buy store says that it is the best quality for the price compared to similar TVs by other companies. I am wondering whether I should get this or a Samsung, Sharp etc. with the same specs. I am also wondering whether I should save $300-$400 and get a similar TV with 60Hz instead of 120Hz. Note that I plan to watch Blu-Ray and regular movies, watch regular and HD television and play PS3 games. Thanks for any advice.