manaking

I'm farming machines atm, got 2, and I'm wondering how to know if my character is ready for ubers. Is there any comparison to know if you're strong enough for them?

http://d3up.com/b/1033709 Here's my character. I farm mp2 but it's a bit dangerous. Other than that I know I have to chance my life/sec sustain for LoH, but I'm having a hard time at it.