Hoang,
I am actually in the process of creating my new shop space. I just moved this summer into a 1935 era home. I have about a 525 sq ft room in the basement for my workshop. I decided to go with dri-core panels.
http://dricore.com/nw/subfloor_about.php
I know some feel they are a little expensive, but I feel my time is pretty valuable. So it was worth it for me. They were super easy to install, I did the 525 sq ft with my dad in about 4 hours. I'm working on electrical next. But so far, I absolutely feel it was worth it. Feels great on the feet, definitely a little warmer too.
Now, with 1500 sq ft, this option is probably a little steep. (Approx $2,500) Perhaps a section of the basement may not need it? I believe there have been some threads on the forum discussing all the flooring options topic at length. Perhaps a quick search would offer some info with all the options and opinions out there.
It's not a easy decision. Do plenty of research. It is obviously not something that can easily be redone if you don't like it. Don't forget, a great pair of shop shoes can go a long way. Good shoes and rubber mats in front of the tools was how I did my last basement shop. worked well, and was quite economical. Good luck!