The question, in my opinion, is how much are your eyes and vision worth?  And good eye protection doesn't come cheap as pointed out by bluecraw.  Right now, I'm wearing Oakley's  8-)

I have diabetes and my eyes are very sensitive to glare, reflection, or poor quality lenses. There is even a big difference in the expensive polarized glasses. I have given away several pairs of Serengeti, Oakley, etc.... because they are like looking through the "hall of mirrors" at the fair.

Revo makes the best glasses on earth if you don't mind getting off the hip a little. My favorite pair is (Revo 9003) brown looking out of the lenses and blue from the outside looking in.

just my .02

i'm a revo fan myself...after wearing them my oakleys sit in a drawer

I used the cheaper one from walmart for years till  I got a pair of costa del mar. Made a world of difference. IMO they are worth the money.

after a few seasons useing the 10-20 dollar pairs i just stepped up to a 100 dollar pair ... the difference is night and day ....i can tell ya  in 2 seconeds witch is better ..... i grabbed a pair of smith action optics ...  smiths where oraginally made for skiers and snowboarders ....  a good lense is needed when on the snow all day .... i geuss fisherman started wearing there glasses and now there is a fishing series ..... also they have the photo chromic lenses ... these photo chromic lenses will adjust to the lite ... the brighter the sun the darker the lense .... early in the morn or in low lite the lenses are almost clear .... they are crazy ....  now i dont squint anymore ,,, i found the cheaper pairs to be just to cloudy and never give you a even view .... with my smiths i get a crisp clear view all day .... i went with a copper lense so i could get the photo chromic lense ... but i will also be getting the amber lense ,,, witch isnt photo chromic ..... ;D you guys can see these on there web site  www.actionoptics.com   i went with the shelter photo copper ..... i have a big head and have trouble finding a frame that fits my head good ,,, the shelter does fit great ....  ;D ;D i will also say i dont work for smith nor am i sponcered by smith just a avid fisherman that enjoys action optics  ;D ;D

Here is thread that was posted not long ago that may help answer some folks questions concerning lens colors for sunglasses.

http://www.bassresource.com/bass_fishing_forums/YaBB.pl?num=1169437336

I am still looking for a good pair of sunglasses, but I am not sure if I want to order them online. I would much rather be able to buy them in person so I can test them out and make sure they fit me properly.

Polarizing isn't the only thing you need to be concerned about. UV protection is more the issue there are levels of protection in UV quality and the cheap glasses don't give you the UV protection that a good pair give. If you like your vision you need to check out on the level of UV protection any particular pair give. The level of UV protection is usually in a numerical rating. If you don't want to go blind best be aware of UV damage to your eyes.

For those whose bait monkey needs sunglasses, these guys usually have good deals:

http://www.campmor.com/webapp/wcs/stores/servlet/CategoryDisplay?categoryId=24504&storeId=226&catalogId=40000000226

For those who wear glasses, is there enough room to wear the sunglasses over the eyeglasses?  I don't want to have to switch over to contacts just to wear fishing shades, which by the way, I need to start doing.