Best online stock trading website for small-time newbie?

[jc]

I'm a young professional looking for the best online broker to start investing. I'm a total beginner, will probably trade infrequently, and likely won't invest more than $1000-5000 at a time. Low cost and user-friendly interface are probably my top two criteria.

Thanks!

 

[seti]

Scottrade
TDAmeritrade (better free trading platform than others)

 

[ACE]

TD Ameritrade, the best for small time and big time.