If you are looking to take peoples money and run in a one hit, yes a name like active marketing would suffuce, but if you want a peoper name for a new marketing site, try something that has an association to the marketing world itself.
CMYK is used by marketing companies when stuff goes to print, so although you could use any colour, one of these would in my opinion be best.
Cyan Marketing .com and .co.uk available
Magenta Marketing both gone, but owner is a member on here, so track em down. They are doing much better than they were when they registered it so dont think they would miss it, except maybe for posterity.
y and k gone but you could try other colour combinations.
CMYK Marketing is available in .co.uk
Colours in business work, yet there are tons of crappy company names out there, and if they had used a colour would make them sound and look more substantial, imo of course.
If you look at the most successful marketing companies in the world, none have the word marketing in
Best of luck.