As you may have seen on the main VGAR page orange is having a best RTS competition. In the competition you can use any RTS game you want and MODS no mater how old as the voters are going to be told its about the best base, NOT the best graphics. The rules are simple build a base take a Maximum of 4 pictures of the base, or a video, Maximum of 3 minuits long. Pictures are to be posted on your own page and a link posted on the competition forums Moddb.com . Videos can be posted on your profile or on youtube and linked to the same page. The competition will last three weeks to give you guys time to build your bases after (if there is more than 20) 20 will be chosen and people can vote for the best. Other information is on oranges forum Moddb.com .
So to finish this news off here is some examples of RTS games you could use....
C&C 3 and mods
RISE AND FALL
So good luck and most importantly enjoy :D