I'd suggest looking into Humble Bundle to grow your collection a bit, especially if you're just getting into PC gaming. Right now, there are two pretty sweet game bundles going on.
The
Capcom Rising Bundle has quite a few neat games in it, including Dead Rising 2/2: OTR/3 and Resident Evil Remastered. All in a bundle for twelve bucks. However, I can only recommend this bundle if you're playing on a Windows-based PC. There are often bundles that are friendly to Mac and Linux systems, but this is not one of them!
On the other hand, the
Telltale Bundle has games that have been critically acclaimed within the past few years, and there will be a few more titles added before the bundle ends. It currently contains titles like Tales from the Borderlands and The Walking Dead. I personally think it's a great buy and I'm looking into the BTA (Beat the Average) category, as I haven't heard too many great things about the Minecraft or Batman series.
Plus, when you buy the bundle, you not only support Humble and the developers, but you're also supporting charities which cycle with each bundle. Humble has been around for a few years and they're definitely legit, if that's one of your concerns. I already bought the Capcom bundle and I'm eyeing the Telltale one.