I don't know how well the firmware is constructed in the gigabyte mice, but the 2nd one is pixart 3305 based with 65 IPS max tracking speed (assuming decent firmware). 3200 CPI registry isn't that great from what I've seen in other mice, but it could be different here. Tracking quality is okay up to 1600 DPI other wise. I would say the first one is Avago 6010 based, but the sensor has been out of circulation for a long time and that 8000 FPS and 1600 max CPI rating throws me off (Sensor is capable of 2k max. I don't know why they didn't take advantage of that just for marketing sake if I'm right).
The Zalman is interpolated (basically the same as just setting windows sensitivity over 6) off the 1250 registry of the claimed A5050 sensor upon looking at neweggs description. This isn't a gaming grade sensor so speed isn't going to be there, nor is tracking going to be anything spectacular as imaging on this sensor is quite small.
-Xornet. I actually have one of these, but the firmware isn't done as well as some of it's competitors using the same sensor. Tracking is okay up to 1000 DPI, but its much better at the lower step of 500. 2000 DPI will be better than the interpolated Zalman.
DKT raptor. Believe this is A3060 or A3080 based. I would probably grab this one assuming I'm right about the sensor and if the firmware is done nicely. I dont know though.
Edited by Skylit - 7/19/12 at 11:07pm