I have mainly played with Alas and I like them, but they are relatively inaccessible these days. I found I couldn't turn very well with Quattros so have barely used the pair I have. The Technisub Stratos are pretty good and are quite cheap here in Canada (I ordered a pair for about $45 Canadian from an online scuba store in the US).

I also have recently used some fiberglass Nemo fins which I think are pretty good - full foot pocket and not hard on the feet. They are the only fiberglass fins I have tried so far and were reasonable in price (around $140 Canadian including shipping). They are a bit wider than the Stratos/Alas so it took some adjustments in my kicking style to get used to them.