I have a Gigabyte GA-P67A-UD4-B3 motherboard paired with a 2500K. I am still satisfied with the performance I am getting out of the CPU with the 4.5GHz stable overclock I have on it and would like to upgrade other parts of my system. I currently have a 256GB Crucial M4 and a 1.5TB Seagate hard drive for data and games. The M4 has started to give me problems with a known bug that causes the drive to not be recognized under the BIOS/UEFI and will not register as active. My data drive is also on the old end, I think it's a 7200.11 series that I bought a month after it was reviewed by ExtremeTech like six years ago.
What types of PCIe based SSDs can I upgrade to? I read all about the awesome performance of the newest Samsung M.2 SSD, but is it compatible with a board as old as mine? I remember reviews about the Plextor line of SSDs being the best, but if I'm upgrading I would like to get the best I can buy with my money.
I'm interested in upgrading my main drive to at least 512GB, but 1TB is not out of the question, because I use my PC for everything. I am a starting game developer, and soon to be game programming student, and have several game engines installed and have a ton of data that I keep on it. Mostly to avoid confusion between what is on the main drive and the data drive.