Yeah it's more expensive because of the upgrades. But the NP8130 can be upgrade as well though, don't mistake it for not being able to support any upgrades. If you stick the NP8150 power adapter to the NP8130, I'm pretty sure you can upgrade it just as good as the NP8150.

Matte or Glossy? I can't tell you this because it's personal preference. I like both though, but from what I have seen, the Matte is very beautiful.

Lastly, I can't help you either on Mucro/Cubehub. I haven't ordered from them before. If one gives you a better price then go for that one.