Heh! Well this one's almost certainly going to just get ebayed for spares or repairs - it's the only sensible thing to do.
Although.... half of me says that by getting these two major things sorted, plus another couple of minor issues, it should be all good for a bloody long time, and would be 100% then. Ok, Activas are going from £350 (in one rare case) to about £1500 or slightly more (in general they start around 700-800 quid), but I'd bet most of those won't have had major surgery like mine will have had done (if I was to go ahead with it), so potentially mine would be worth towards the upper scale of what they go for (it's a decent clean, fsh'd one). And forgetting resale values, it'd be all good in terms of carrying on owning, driving and enjoying the thing.
But it still really doesn't make financial sense to get the work done....
Peter