Can't say I have but there are many players in the space. Still I hate when people assign fluff terms like "industry leading" when they clearly do not lead the market. To be fair, everyone does it but it just doesn't sit well for me.
In any event, I don't know many players in your price range, all of the companies I suggested are in the top-enterprise level although Venda may qualify for your range and MarketLive is certainly worth chatting with.
You may want to attend eTail in a few weeks. It tends to be a little higher price point but you'll get many of the major players in one room to talk too rather than trying to hunt down sales leads at each.