the time shoe u have its pretty good, in a matter of fact time is actually making shoes that are not even similar to the ones u have/had, new time shoes are pretty bad (dont know in MTB).

The only thing similar if you can find it is a pair of carnacs quartz or something in that line. Sidis are pretty good but for some reason they are still doing the same shoe than 20 years ago, new materials but basically is the same shoe. Northwave are pretty nice shoes but arent that narrow in the ankles so probably u wont like them that much, always u can try them. The nice aobut northwave is that the cleat holes things move so u can adjust the lateral position a little bit better than any other shoe in the market (good idea)

Good luck