Good Day, Gentlemen

I beleive that a good answer to this question will benefit a few newbies like myself. For a month now I was thinking what is the best option I have to reinvest 3000 USD in bitcoins I have earned through few months of litecoining. I definitely cannot afford any serious mining unit on my own and I do not mind a little bit of risk. What do you recommend me as my best option? Currently I am looking into taking part in some group buys, in particular this: https://bitcointalk.org/index.php?topic=366325.160

Would like to hear your opinion and recommendations on  the options I have.

Thank you!