From what I've read...
Remap, no impact on engine/drive train longevity, apart from clutch which is weak on manuals. So most tuners will recommend an uprated clutch for a stage one map. I currently have a tuning box (which makes a massive difference, despite what some will tell you, granted not as good as a remap!), turbo elbow, intake pipe, panel filter and Pikey R600, so you may wish go for those before the remap.
Wheel is purely personal preference. I like the Austins, so don't plan on changing. You could go for Uniroyal Rainsports to cover all bases?