Asset Allocation for My Roth IRA

After I'm done with asset allocation for my 401k, I move on to Roth IRA. I decide to max out the its contribution limit ($5,000 for year 2008) as well. Since I'm not limited to pick from a few costly but mediocre performing funds like in the case of my company 401k, and my 401k is really a conservative approach, I can afford to be more aggressive for my Roth IRA. I set the mix target via the following aggressive-conservative-conservative levels:

1st Level		Target
	U.S. Stocks	50%
	Foreign Stocks	40%
	Bonds/Cash/Others	10%
	Total	100%

2nd level	Giant/Large	80%
	Mid	20%
	Small/Micro	0%
	Total	100%

3nd level_non foreign	Giant/Large	60%
	Mid	20%
	Small/Micro	0%
	Total	80%

Like my 401k, when I do my contribution allocation, I will follow the above target in the level-ordering fashion because I think the first level has most dominant power on my portfolio. To avoid things going wild, I have to hedge the risk involved in the second and third level significantly by allowing only 20% exposure to the mid/small caps.