On the other hand I've been using a 1m aluminium dish on a Motek 2100A for 6 years, first off using a Skystar 2 and now a Prof card driving the motor directly. I'm in an exposed location and the dish takes a battering from the wind, so much so the motor is just about shot but I've never had a problem with either card. The only precaution I have taken is to install a PC slot fan that sits above the card to extract as much heat from it as possible and vent it out the case.
Software, TBH it's probably down to personal choice or whatever is the most stable on your system. I've tried quite a few different DVB programmes and it's never hard to make them crash but I've found the best mix of stability and features (for me anyway) is DVB Dream. There's an OEM version of 1.5e that ships with the 6925 so you might have it on disk with yours? Smart DVB is another one worth looking at, the only reason I don't use it more is because of my familiarity with Dream but it has some nice features. ProgDVB, buggy as hell the last time I used it, tried most of the others too but didn't like the 'feel' of them.