I can see the Lambda Life 3 in there, but it's not going to happen. Sierra was revived by Activision and has been designated as an indie label. I highly doubt Valve would work with Activision for publishing, and they would be much better off publishing it themselves, like all of their recent...
I just got XCOM through the Golden Joysticks, and Payday 1 is free tomorrow, so I guess there's nothing else I'm really interested in. Really cool they got this many devs to do this, though.
Mine all suck, the most expensive was less than a dollar on Steam Market. I don't uncrate. I love my Stainless USP, though. I also like my Hive P250.
http://steamcommunity.com/id/MrSirShpee/inventory/#730_2_603841374
The Source version doesn't really look right to me. There's HL2-like water w=next to 1998 textures, because all the models and textures are the same as in HL1. There's also better lighting and ragdoll physics thanks to Source. That being said, I don't think it's really worth it if you already...