High growth potential investments?

[Clayton W McGehee]

Hi, I currently put 600-1000$ a month into a fairly safe 5% interest bearing account and I want to start putting about 100$ a month into something that is more high risk/high reward as well. I am considering doing this via 2 ways and just wanted opinions from people who may be more knowledgeable than me. 

1: Investing in Prosper Loans buying C and lower loans (25$ per loan to diversify)

2. Buying something like the AMLP ETF. It seems to have a yearly payout of roughly 8%. 

I would really like some opinions on these options or maybe other options. This is meant to be a long term investment so being liquid doesn't matter. 

On a side note the 600-1000$ I put away a month to my other account is to buy real estate in the near future. I will be able to buy a home completely outright with no loan whatsoever hopefully within the next 6 months. It will be a cheap home mind you, but luckily my father was a contractor and can help me fix it up very cheap.