I had to do the same thing, was getting absolutely rocked on NM, dead in 1-2 hits and taking forever to kill things. Spent about 75k in the AH upgrading everything and now it's fairly easy. What build are you using for your Wizard?
I'll have to look when i get on and yeah after dropping a ton of gold on the AH i rock NM.
As for the Wizard build
Left Click - I change between Electrocute w/ Forked rune (in NM i have been using MM w/ Split more so but in Normal i was rocking mostly Elec.
Left Click - Disintegrate w/ Chaos rune
1 - Diamond Skin w/ Prism Rune ( i went back and forth on Frost Nova and this but i prefer Diamond Skin because kiting isn't a problem for me and if i get stuck in a sticky situation i can just throw it on and burn them or flip the Archon switch.. maybe when better runes come up i will switch it out
2 - Hydra w/ Lightning Rune because it does 6% more damage and i go back and forth between that and Blizzard but i keep coming back to Hydra because i like the support
3 - Familiar w/ Spark rune because it gives me a 12% damage increase and IMO that is better than horrible magic weapon and the armor spells
4 - Archon (Archon is actually on hotkey 3 but so it won't confuse people who don't use elective mode it's "mastery" which is 4)
Passive Skills
I can't say 100% without looking but i believe it's Astral, Glass and Blur.
For the most part yes, but I think they made a mistake in going too far away from runes being tied to your skill progression too. Now I can't have 7 split multi magic missile like you could before with a level 7 rune.
I think they could have incorporated the pros of both systems with minimal cons.
I just wish they added more options with the runes because only 1, maybe 2 runes on each skill are worth using and the rest are complete garbage.
Anyone want to rank the acts?
For me:
2>1>3>4
With 2 being my favorite by leaps and bounds.
1 > 4 > 3 > 2
Funny, i can't stand Act 2.
For some reason Act 1 is my favorite, i could play it over and over without getting bored and i just don't know why.. Same with Act 4, i would say 1/4 are tie.