Where should I save/invest my money?

Ok. Here's the scenario: I work for a company that has a 401K Tax Deferred Savings Plan. They Do Not offer any match. The allowance is 35% pretax and 5% post tax. I also have a Roth IRA with Charles Schwab that I set up myself. I don't currently have much in the IRA right now. My question is what is the best mixture of contribution? I currently put in 10% pretax. Should I max the pretax first? Should I do 5% & 5%? Is the 5% after tax basically the same as my Roth? All of the money in my 401K is invested in a target retirement fund. I want to diverse myself in the best way.