Due to their second Birthday, Hashflare offers 10% discount on all of their contacts. If you do plan to add a bit more hash, try to do it during these discount periods, it shortens ROI period.
Also, take into account the fact Litecoin mining difficulty has been going down since February while price went a bit up and I still choose LTC as my preferable mining coin. As always, make sure you understand all the risks first.