Appreciate all the feedback. I'm mainly asking because it seems like my OS and perhaps a few other small utilities programs/drivers (not games that I'm aware of) have consumed nearly half of my 150GB in about a year or so. My 1TB drive which has multiple FPS games mainly (CoD's and Battlefield series) has consumed around 40% of the space. I'm a little concerned with this new build (i7-4790K, ASUS Max. VII Hero, G.Skill CAS 8) in that my OS in time is going to start consuming a lot of the space on the primary 150GB drive. Seems odd that OS's and drivers are starting to consume so much space. I've in the past about going with an SSD, however my friend who has a higher end rig than my past build actually has a bit slower load times on servers. Perhaps it's just his configuration. On servers, I tend to be one of the first on. Past build was an i7-920, ASUS P6T Deluxe V2, CAS 8 memory with those HD's.
From the feedback here, it seems like there is benefit to allocating the OS to it's own drive, however consolidating everything onto a 512GB SSD might be the best solution. I could save some space by eliminating some games I no longer play. Looking at reviews on Newegg, it seems like Samsung is one of the good ones to go with? Any other suggestions? Thanks again for taking the time to provide the feedback.