Yep that sounds right to me, though if your completely anal about Vauxhalls (as I used to work there) J to M Mk3, N to R Mk3 facelift! sorry couldn't resist.

If you stuck to the 8 valve engines they were more than bullet proof, not uncomon to see some of our customers come in with engines that had been around the clock several times and still sweet.

I didn't like the new 16 valve ecotec engines, nothing but trouble, ECU problems, air flow meters, Timing belts that snap at 30k, totally rubbish wouldn't touch with a bardge pole. Avoid these engines from M to R years, I think they have improved them (though that wouldn't be hard) now.