I used to use KLHs back in college. If you want cheap speakers that you don't care if they get messed up, or want a speaker to base a project off of (like I did), then they are great values.
In my case, I bought them for the cabinets...added some bracing (OK, I added LOT of bracing, heh), gave it a real dose of poly-fill, remade the crossover and used better drivers. When done I had a set of speakers that gave a set of MTX PA speakers a run for the money in pure loudness, while still sounding pretty darn good. That was my first real speaker-building project.
For a decent low priced subwoofer you may want to look at some of the kits Parts Express puts out (if you are a fan of DIY projects), or check out Yamaha.