You can never go wrong with a mr.limpy for a first stp or packer. The packer by itself is fairly inexpensive and if you don't want to spend a bunch extra on one that's already made into an stp, you could always make one yourself with a bit of supplies from your local hardware store. Tranzwear sells good priced stps and packers and have great service, I'd definitely recommend them if you're in the market.
