Share, which domain API is best for domain drop-catching

I have started two days ago developing some Java code to experiment with drop-catching. The API that I have used so far is Directi(ResellerClub). I was able to catch my fist domain name (it was with *real* PR2) and I am very excited on the matter.
Do you guys use something else, different that Directi? Is there better API/APIs in terms of calls per second/minute and etc?

See original post by MrBeanBG