I personally love older women (my ex wife is 44, and I'm 30).
I like the term MILF...most older women do too. However...
I despise the term Cougar. It seems demeaning to me, for some reason.
Personal preferences aside, MILF has been overused...I know of a Cougar dating site (big surprise, I'm a member of

), but not much else.
Roll with the Cougar brand dood!
Good luck...and let us know what the name of your site is! (Ok, just me dood!)