another one to try is- Aurora. It is a 4X game that uses a sub-pulse method of game advancement. Sub-pulses are pretty much "micro turns", that is, you give your orders, and then hit a particular sub-pulse interval. That interval then passes within the game, and you can now give new orders.
Downside- needs a minimum 1280x1024 resolution (workaround lower down; 1280x960 CAN be done though it isn't recommended, see the forums for sys requirement of the game), and you need to join the forums to be able to download it.
Upside- its on v4.7, and is completely free. To be precise, v4.2 can be downloaded without joining the forums, but to obtain the 4.7 patch (or use a later clean installer, like v4.6 or such), you do need to join. The install requires only 100 MB install space (database file may grow over time though).
The workaround to the high resolution requirement- get this freeware program, 360Desktop. It is a "scrolling desktop" utility application, and comes with 2 panoramic backgrounds. Many others can be downloaded from the site (using IE or Firefox) or directly from with "360 Manager" component of the application. This utility will allow one to "scroll" around the desktop to reach the different windows Aurora uses.
360 Desktop has 32-bit and 64-bit Windows versions. The program is Windows-only.