I like Hexatrack but they are full at the moment..

Second is keywordspypro.com but its $80 / mth..

both of these options let you just enter in KW, then generate longtails, display competing ads, length of time shown, landing page, pretty much everything and you just clone the ads and refine a little..

I personally like to find the best ads on G and then run identical ad on Yahoo, usually the same advertiser is not running same campaign on both S.E.

Good luck, if you want to get in on Hexatrack let me know I can send you a private link to Amish & Larry who run the site..