Highly doubt you'll get anywhere near $1200 for 3 year old tech. Craigslist has lots of flakes/scammers but also plenty of legitimate buyers. How you list your ad is critical. Also your location (big cities, urban centers are much easier for tech transactions) is important. Along w/ the random variables of luck and timing. You should probably lower your expectation to ~$1k if you decide to continue.
I stopped selling my used tech gear on CL and opened a seller account on Amazon. I had a CPU, motherboard, RAM and graphics card combo listed on CL for several weeks at $550/bo and never got an offer above $300. I listed the pieces individually on Amazon and sold them for over $800 in a couple days. Since then I listed some other stuff I had laying around and I'm close to $2000 in sales now.
I had one buyer who wanted to return a video card because he claimed it wouldn't fit his system, but once I explained he'd have to pay return shipping and a 20% restocking fee, he decided to keep it.
It takes like three weeks to get paid, but it's not like Amazon is going to make off with your funds. They take about 9% in fees, plus the shipping amount doesn't always cover the cost of shipping and insurance, but it's close enough. It's a small price to pay to avoid the CL flakes.
Just look up the item you want to sell, copy the ASIN, and use that to list your item. You can specify your price and any condition issues or options. You need to be quick about shipping or they will suspend you, but I drive by two POs on the way to work, so no problem.
Since buyers can pay via CC, they're usually willing to spend more than locals on CL. I mean, how many people can put their hands on $1200 in cash?
Good luck.