Just grow what you like to eat! All that work is worthless if you don't enjoy the fruits (in this case leaves) of your labor. I personally like Tetragonia tetragonioides; commonly called New Zealand Spinach or Sea Spinach. Within reason, any plant can be grown in hydro. If you are looking for a challenge- would be quite impressed if you grew some carrots in DWC.

I have some personal favorite lettuce types. For me I like kinda mild lettuce and salad bowl is nice a bushy though it can crowd stuff next to it. Try the link at the bottom and there is a favorites link near the top of that page which will tell you what I know about those lettuces I like. I got to discover different types of lettuce by using a Mesclun blend but it can be tricky to figure out what the exact types are to buy just one type in the future. Challenge with the blend is that some will grow taller than others and hit the light or they grow at different rates and the slower ones get shaded out.

Good luck

Here is a link that might be useful: TCLynx Hydroponics

thanks for the replys,

I had a pair of mixed seed packets I bought for last spring's soil garden, and I recently purchased a Mesclun mix from seedsofchange.com, so I'm off and growing...

Carrots?? Hmm, that may be fun if I can figger a way to support the grow medium with the bottom of the mesh pot cut out...