25% I think. Recap I have money going into a 401k and a Roth 401k, and I have a rollover IRA
i'd max out your traditional 401k first, assuming you have reasonable investments available to you through that plan. if you still have money left after that that is taxed at 25%, i'd go with the traditional ira (unless you think you might want to retire before 59, then maybe probably roth ira). if you can't max out your traditional with 25% money, i'd put however much of that money there is into roths (ira, 401k, both/whatever).
if you still have money left after maxing 401ks & iras then throw it at your hsa if it's not maxed or your kids, whatever. or eff the kids and invest it as taxable money.