Thanks to all for the suggestions. As it turns out, I ended up with an SP-01 Tactical, and a Streamlight TL-3. Like the pic with the SP-01 and the TL-4 a little earlier in the thread, it's a bit of as reach to get to the switch (fortunately, I have decent-sized biscuit grabbers!).
I have a question for the TL-3/4 owners. Key E is the recommended key, and fits the rail perfectly. I did, however, notice that Key B come close to fitting (it's a little too big), and results in the light being a little closer to the trigger guard. Has anyone tried filing/sanding down the Key B tab a little to make it fit better on the CZ rail and, if so, were you happy with the results?
Thanks!