If you own FL Studio, head over to samplefusion.com, click "Samplefusion" on the left, and then download the "FPC Drumkits" samples. Believe me, they are worth it!
There are some other good samples there as well. Almost all of their Orchestral samples are definitely worth having. (If you've got DirectWave, you can get even more, and from within FL Studio!) Their "killer tweaks" and such are, (IMO) not worth the bandwidth you use downloading them.
For good Drumkits, Compression/EQ'ing is everything. Getting that "punch", and sometimes even an over-compressed sound can really help!