It really all depends on your horizon and risk appetite.
When I started early this year, most of initial ICO's I participated in were only with 0.15 eth or around $50 that time.
A couple of those provided huge returns, like SAN and DENT, bothboomed recently - the $50 contribution to each became $1,000 in around 6 months.
I hope you find a good ICO to participate in. Do due diligence and caveat emptor!
Go get some good airdrops and sig campaign like DeepOnion to increase your stack.
Good luck!
