The Enduro's are great bikes and I'd certainly recommend one. Afraid you couldn't run a bolt through axle on this frame, but it's plenty stiff enough and doubt you'd notice and flex on a normal qr. Plenty of people have changed the rear shocks on these. Think you'd struggle to get one exactly the same length, but do some google-ing and see what lengths other people have fitted.
You can pick enduros of this age up for £500 on eBay, which is a bargain! Allow for spending a little bit on any maintenance, but you'd get a bike that's very capable for such a low price
"The things you own, end up owning you."