Powerbot or RiD
Powerbot:
Minimizable
Great Scripts
Fast
Overall Reliable
Downside: Want multiple bots? If you only need 8 then shell out $8 per month, if you need unlimited shell out $150 p/month.
RiD
Undetectable
Runs Great
Fast
Flawless Scripts
Cheaper then Powerbot
Downside: Can't minimize unless you want to go through the trouble of getting a virtual machine.