Stare At The Sun

Alright, I admit it, I love to turtle in RTS's. Build massive layers of defense, walls, turrets, missle launchers, tanks, bunkers, sandbags, arty, whatever the game allows for, I'll build it.

The only problem is, I have yet to find a game that really fits this, or caters to this. The closest I have found is supreme commander, but that game is so buggy on vista, it crashes constantly.

So, I'm looking for someone to point me in the right direction for a defense friendly RTS, age and graphics don't matter to much, and my rig is good enough for crysis, so any/all games should be on the table.

Thanks in advance for any new games you can recommend for me to try.