You can have both a Roth IRA (after-tax contributions) and your 410k, but you can't have a traditional (pre-tax) IRA.
With no matching, you should put the maximum into your Roth IRA, then after that put money into your 401k if you can afford to and it offers at least half-decent mutual funds.
You still get an instant 30% growth in your 410k money from the tax savings, and when you change jobs you can "roll over" the money to a brokerage that will let you buy good funds.
For the Roth IRA, I'd suggest
www.Vanguard.com and their VFINX fund (S&P 500 index). If you put in the $3,000 for 2004 and another $2,000 for 2005 you can avoid paying any account maintenance fees.