What's your price range? I saw the new Viking (Diamond??)demo'd a few weeks ago. It adjusts pressure and tension according to the thickness of your fabric. It's quite pricey but it has some amazing features.
I use a Brother ULT, no longer made, but it has sewn everything i have asked it too. I find the Brother machines are very user friendly and reliable. My DDs have the less expensive ones from WM but they have had no issues with them at all.