What do you think of my 401k investments?

For those investment savy people.
I am doing 5% per paycheck to invest in my 401k starting April.

This is my breakdown. Keep in mind, I am 24, so I am trying to be very agressive.

Templeton Growth(A) 10%
William Blair Intl Growth (N) 5%
Munder Large-Cap Value (Y) 15%
Comerica 500 Stock Index 25%
William Blair Growth(N) 15%
Franklin Rising Dividends(A) 10%
Munder S&P Mid-Cap Index Equity (Y) 5%
Munder Mid-Cap Core Growth (Y) 5%
Neuberger Berman Genesis Trust 5%
Heritage Small Cap Stock(A) 5%

This is 100% stocks. Would you change any percentages around? if so, why?

Also what happens if my company goes under? Do I lose everything? or can i rollover it to a roth ira?

I have only one suggestion. You need more international equity exposure. 5% is too little. It should be 25% minimum. I do not know what other international options you have but some in a developing market fund would be good.

although this is 100% stock portfolio but In my opinion is not aggressive enough. You hit on all classes(small, mid and large). Since this is your 401K, I would not say just focus on 3 or less but I would shrink this by one or two.

Most likely, non of these all go under anytime soon... but one can never tell because of recent Bear Stearns event. The way you are spreading it... only 1, at worst 2 will go under IFFF it gets really bad but highly unlikely.

You can roll it over to Roth IRA once you become an ex-employee of the company you join the 401k with. Details are in with your company, check with them first before you switch.

my advice is to kick up yoour 401 k contributions as much as you possible can and worry less about your investment portfolio. you will be amazed how this growns over the years. when you get old enlough to retire, there will probably be no social security and it will be up to you to finance your own retirement.