FWIW I’ve a 2004 Enduro as my main full suss bike. It’s been upgraded to the point where the only original component is the frame itself, but it just seems to get better and better over the years as I bolt newer kit to it.
I’ve also got an ’09 Wolf Ridge, itself massively upgraded and an Orange Pure 7 hardtail too, just to put it in context.
It’s worth checking out Bikescene, they’re doing some offers on Spesh frames right now and I’d go so far as to suggest that a Stumpy Evo is probably a worthy sucessor. You’d probably need to budget for a tapered fork too, but everything else could carry over, with the possible exception of the cranks.
If my Enduro dies tomorrow, a Stumpy Evo would be my first choice.