Lot's of variables, how old are you? How much longer to you want to work.
Here's a roth vs. traditional calculator,
http://www.youngmoney.com/calculators/retirement_planning/roth_vs_ira
Do you flip the ESPP or are you keeping it? I would think twice about having too much invested in your employer, no matter who it is. If you flip it and make the usual 15% it's usually a good deal.