I'd switch out V for SGU and bump Firefly up to the top spot, ditching Sarah Jane completely.
What happened to SJA was horrible, tragic and untimely, yes, but it wasn't cancelled in the usual sense, so I personally wouldn't have included it.
That's actually part of the reason I did include it- to point out that sometimes the untimely end of a show can be *not* due to suits being cunts...
I deliberately didn't want Firefly in the top spot. SGU... I think Stargate went tits-up round about the end of SGA season 3, when they got rid of Weir and Beckett, and would have rather they'd rested it for a couple of years and brought the franchise back refreshed - but if I didn't have to mention Human Target (which I did, part of the brief, though i also enjoy it anyway.) SGU would have had its slot.
V wasn't part of the brief, in case you're wondering - in fact a lot of commenters on SyFy UK's facebook page seem not to have known that it was cancelled. Most of the commenters are Americans, oddly.
I would agree with you to a certain degree, I think getting rid of Beckett was one of the worst mistakes SG:A made. You generally don't kill off one of the most popular characters and if you absolutley must you do it in a a better way than exploding tumors.
Sliders made the same mistake, getting rid of the Professor in S3 just accelerated the rot.