What about this one for the same money?
http://www.samsclub.com/sams/shop/product.jsp?productId=prod4410282&navAction=push
Not that I'm an expert, but I personally would be a little wary of Vizio. Like you, I had a Phillips and it went dead on me. Since then, I've decided to only stay with the higher-end brands. (And maybe Hitachi isn't a great TV, either, but it looks really good at the store.)
Edit... Crud, nevermind, that's online only. But at our Sams, they've had a Hitachi 40" that was like 448. Not sure if it was 120 mhz, though.
Also, at the Sams near me they've had an LG 42" 120 mhz that was the same price or even $550, IIRC.
I'd check Best Buy for sales, too. They rotate what's on sale every week or two, but they have some great deals, usually better than Sams.