Instead of building a miner, buy shares in one of the mining companies listed on glbse.com, there is SIN and DISHWARA, you can find more information on them in the forums.
It means you can invest only a few btc into it if you want instead of a lot.
Be warned though we do not vert or check anything listed on GLBSE.com.
disagree. investing in OWN project is still more interesting for majority, until complexity rise again. but thats time close enough.