If I was going to go with 100% stocks and then wanted more risk than that I would go with small value both domestic and international. Read a few of the hundreds of threads dealing with French-Fama risk factors on this forum.
Think about what is meant by long term and understand a few of the errors that we bring to investing such as regretting under performing an index for 5-10 years because we decided that long term meant just a few years instead of 15, 20 or 30 years.
Rick Ferri had a nice article a year or so ago that dealt with long term perfromance of one risk vs another risk. With a bit of looking on his website you will find that article.
Also, think about you ability to withstand a severe equity downturn like 2008/2009. Can you stay the course or will you sell low when you lose 50-60% of you savings that you accumated.
Here is a link to another of Rick Ferri's articles that deals with risk as a new investor. maybe you know this stuff already.http://www.rickferri.com/blog/strategy/the-flight-path-approach-to-age-based-asset-allocation/