Infinity, Polk, Boston Acoustics... all in the same price-to-sound category pretty much... I personally have all Boston speakers... home and car... and ive installed them in both of my parents vehicles... they have a great overall sound, and I can get good prices on them!!!

Polk is my second choice... again, a very clean, warm sounding speaker.

All 3 companies have different "levels" of quality... like Infinity's Reference and Kappa lines... Boston and Polk both have numerous product lines.

Their lower priced models share some of the great sound of their bigger siblings... just at a more reasonable price... with the higher prices models, you'll get increaced power handling, usually better build quality and other "extras" that add up to better sound. But, the higher priced models, also usually require a little more power to produce their best sound as compared to the cheaper ones.

I do not have the high-end Boston speakers... and I am still overly pleased with them...

I definatly say which ever of those 3 you can get a hold of... go for it... if you can, listen to them in person... its not always the best way to tell, as they will sound totally different in your car, but it gives you a good idea.