SpellForce: The Order of Dawn
A Bit Like alcohol and pregnancy, genres don't normally mix. But nowadays, anything goes, so up steps Spell Force. At first glance it's a pretty standard fantasy RTS, but upon deeper perusal, you'll find all the stats that a heavily-bearded RPG fan could possibly yearn for.
Complementing the actually-quite-good mix of genres is a pretty engine, an impressive range of units and enough main and sub-missions to keep you occupied until the sequel's release.
However, the otherwise great mix is let down by a poor story and the fact that the battles require very little strategy to win, with defeat being the harder to achieve option (for once). But for this bargain-basement price, less than two pints of lager-beer, you can't complain at getting two genres for the price of one.