In June of this year, someone gave me an old gaming PC with an Nvidia GTX 660. I researched mining, and started out mining Monero back when it was trading for half of the value it has today. I summarized most of my experience in a blog post a while back, but I think it's always interesting when other people give mining a shot with gaming PCs or other hardware that they already own.
You'll have to let me know how it goes with SmartCash. Now that XMR has spiked in value, it's not nearly as worthwhile for me to continue to mine with that PC. Maybe I can consider switching it over since it runs 24/7.
Thanks for sharing.