HD-SDI Recording Solution
 

I bought an NX5 a few months ago, which outputs an uncompressed 10-bit 4:2:2 1080i signal via HD-SDI. I would like to make use of this any bypass the 24Mb/s AVCHD compression, which I find quite limiting especially when it comes to grading, motion tracking, and green screen work. I'm looking for some sort of portable device which I can use in the field with my laptop if need be (without would be best, but I can't afford a nanoFlash) which could record this stream directly, with a bitrate of at least 100Mb/s in a few different formats (ProRes not neccessary because I don't have a Mac). Does anyone know of any low-cost solutions (I'm a student) which would fit my needs? I wouldn't mind recording over HDMI either because my camera outputs the same signal via that, but HD-SDI would be best for me.

I've been looking at getting a Blackmagic Intensity Shuttle which inputs HDMI at low-cost over USB3.0 (Id just get an adaptor for my laptop), or the DeckLink in an external PCI housing (but that would bring the cost up to almost $1,000, which is more than I can spend). Does anyone have any better solutions?