Looking to upgrade my interface.

Hello, I have a Protools 10, 11 & 12 bundle, Windows 7 professional x64 and a Fast Track interface. It seems natural to upgrade to one of those new Mbox (specially since the last driver for Fast Track doesn't work well and Avid support couldn't find any solutions). I haven't been able to find the interface without Protools so I decided to create this thread hoping I can get good advice and ideas from the community to clear my mind. I'm looking to get at least 2 mic/line preamps and the best quality/latency response from a very tight budget. I have no preference in terms of brands. Thanks in advance!