I work in a liqour store and have had the luxury of trying many different vodkas (vodka also happens to be my "go to" spirit). To me the best values (price to quality) are the afformentioned svedka, and even better a recent import from poland called sobieski. The sobieski is very smooth while still maintaning character. In my opinion it compares favorably with belvedere (it is actually from the same distillary). I do also like Vikingfjord and to a lesser degree because of price luksosowa. As far as high priced brand names...they are all overpriced because of their names. These companies also tend to rest on their laurels, and thus the product is often inferior to some lesser priced vodkas. Stolichnaya and Finlandia are two brands that come to mind that are very good and only somewhat pricey. Although better values can be had (vodkas that are just as good at much better prices) these two are not ridiculously overpriced. There is enough competition in the industry to allow premium vodkas to exist without premium prices. Of course once those blow up for their quality and value prices, their prices will go up and the quality will diminish because all of their money is being spent on advertising.
Good vodka values (premium stuff): Iceberg, Svedka, Ruskova, Sobieski, and Vikingfjord. There are of course more but this is off the top of my head. Of those listed my current favorite is Sobieski. It is actually the cheapest and best tasting to me. Keep in mind that the values listed are as good or in some cases better then the super high priced "premium" vodkas. I think Sobieski compares favorably with the very best the vodka world has to offer.
Anyway my 2 cents...give some of these reasonably priced brands a shot and I doubt you will be dissappointed.