as good as the Blade 7000s are, its not linux so not much to "play" with, just flash it with latest firmware and watch TV, does a very good job too.
but if you want to start playing with cams, scripts etc etc then id go for a Linux receiver, the one that gets recommended is the qbox mini hd, for the price i don't think it can be beaten.
news on the grape vine is blade are making a new combo receiver, cable and satellite, but not sure if the tuners are swappable.