If you're going to buy a control surface for PT, just bite the bullet and get an avid artist mix. Not only are they one of few controllers that are completely supported, but they are the absolute best controllers out there iMO.
Also you say you aren't in a hurry to upgrade, but that can change quite quickly and it would be horrible to buy one of these things and then have it useless to you in a year. Pay more now, and have a solid unit for 3-5 years.
However, I'd really suggest you rent/borrow any controller before you buy and spend a few months on it. I was totally amped when my studio partner bought a artist mix unit. The first few weeks I used it all the time, and as said above, my mixes came together quicker and more organically. But after less then a month, I never turned them on, and became quite bored with them pretty quick.