I have been using a simple flashmeter mainly for studio photography: the Gossen F Digipro. While that flashmeter perfectly satisfied my needs, I recently discovered another reasonably priced option: the Sekonic L-358, a more high end option. This flashmeter has a number of significant advantages like possibilities to record info but also, and that's a very interesting feature, the possibility to add a wireless module to drive, for instance, Pocket Wizards, making it a very useful tool for any "mini-studio" photographers using standard flashes piloted with Pocket Wizards.
For people in Europe, you can find the Sekonic over here:
And the wireless extension module over here: