Blade 7000 is being replaced with the 8000s combo.
Not used the 8000 so can't really comment. Looking at the price I assume it will be
similar to the 5000 with a cable tuner added.
It depends on how you are with boxes, Blade 5000s is easy to set up, easy to use, similar to skyboxes but better
quality, it has on line function where you could download channel lists direct to the box, so no messing with AJ's and USB sticks.£80
If you are quiet happy setting the boxes up I would tend to go for an E2 type box flashed with ViX image from world of sat.
They are more fiddly to set up but once they are set, they need very little tweeking.
Faster procesors, so very good EPG's, and less lag in general use, better quality again, if you only want a single tuner
VU zero is new out, or Gigablues seem fine too. £110 -140
There is plenty of help about for all of these boxes so you shouldn't get stuck.
These are tried and trusted makes, I personally wouldn't go for a cheaper / similar
clone box, but there are plenty on here who would.