I can recommend Ipe from personal experience, although it has been a few years since I've used it.
It is a little clunky, but it will dovetail with your version of LaTeX quite well. You can add preambles to pull in LaTeX packages to your figures. So you can get the fonts in your figures to match the ones in your LaTeX document, for example.
You can save (and indeed edit) Ipe figures in PDF format, so they are easy to include in LaTeX documents.
There are some examples in a preprint of mine from some time ago. Checking my Dropbox, I see that I still have the two figures. I can send them to you if it you like.