If i remember correctly you already have a 401k plan in place. Its not a good idea to have all of your money tied up into long term investments. The penalty for early withdrawl/close will greatly offset the interest earned in the accounts. Granted, you are able to withdrawl some of that money free of a penalty for a small number of reasons. Its should be used as a last resort.
If you are looking at buying a house, get into a qualified IRA. That way, you are able to withdrawl your money from the account for a qualified first home purchace or down payment. Qualified means following the IRS regs on IRA contributions for the Year. You could put that money in before april 15th, you may get a tax advantage for 2004, by lowering your taxable income. Then you can put it more money for tax advantages for 2005 at a later date.
Interest rates are on the rise for cd's. So you wont want to be tying much money up in them. Its probably better to leave it liquid in a savings account until you get at least 2.5k in there. Remember, getting a lower fixed rate of return on a small percentage of your money not always a bad thing, especially when you have 75% of your 401k in medium/high risk.
You dont want to loose everything you have, even at a young age.