Highly recommend the 5 speed if you're worried about the power. I merge into Fast and Heavy Interstate traffic everyday on my commute and it does just fine.
Also - You won't regret the Access Cab - Great for trips to the grocery or where ever.
Be sure to check out the rear leaf springs. 2+Overload is not going to like the 1000 lb bed payload rating. Make sure it has 3+Overload.
I love my 2.7L. Gas mileage is pretty good too.