i use this. just add plywood and 2x4s. you can make it as wide or deep as you want. you can find it cheaper so look around. it is very sturdy.
Amazon.com: 2x4basics 14429 Workbench and Shelving Storage System with Hooks and Clamps: Home Improvement
That's one solid looking bench. Did you put a shelf unit on top? Is the table top made of 2x4's placed side-by-side? What are the lower shelves made from? If you don't mind, how much did you invest in the wood?
This is the bench I use. Very sturdy. You will need to pick up with a truck as the box is large. Assembly is very simple.
Sam's Club-Seville Commercial WorkBench
I know you said you didn't want to BUILD it yourself, but how about cut and assemble?
Cabela's -- 2x4 Basics® Bench Kit
I looked at this the other day and doesn't look too bad... Can determine your own length and width, and the legs and shelf holders are already done, which is usually the hard part.
I just got a flyer from Harbor Freight and on page 3 they have a coupon for a 60" solid oak workbench with 4 drawers (lot # 93454) for $139.99. I would consider going that route before building my own, if I were needing one.
The coupon should be available in-store, as they always have flyers when you enter the store.