3-Way shower valve

We are building a cabana with a shower. My wife and I enjoy showering together. We want to have simultaneous flow from both the shower head and the handheld. All the single-handle valves I've found have a diverter which permits flow from only one head at a time. I think I could plumb two single-handle valves (one to mix hot and cold input and one to supply the two heads in what ever proportion we like). I realize we will be sacrificing pressure and flow when both are on but we can accept that. Do you have any better idea or know of an available valve to do this?

Here's a link to what you are looking for, I think.

http://www.showerbuddy.com/Showroom/_Shower_Head/Dual_Shower_Heads/dual_shower_heads.html

you can increase flow if you upsize your pipe, at any point along the chain!

Leroy, if you install separate hot and cold taps, using 3/4" pipe for the mixer T, and 3/4" for the run to the splitter T, and for that splitter T, and even for the run to each shower head (/handheld), you will get more flow. The second T can be in the wall copper so it costs less than a chrome fixture.

I like your idea of using single-handle valves too.

david