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This thread will be really relevant to your interests:
http://us.battle.net/d3/en/forum/topic/6146727550
I made the switch with around 400k, but that was about a month ago. So with inflation it might be a little less feasible. The big money went to the weapon, source, and jewelry. If you're focusing on A1, you can get by with ~300 res 30%crit for starters. I was only listing at something like 13k dps on the char screen, but once you start spamming explosive blast you are doing much more dps than you think. just make sure to literally mash the crap out of your diamond skin, nova, and explosive blast.
Go defensively too and use -cooldown passive/runes where you can. I liked having energy armor with prismatic rune for the extra resists. makes a huge difference. once you get the better gear you can start trying out some different things with passives/runes/etc.
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