Let's not get the cart ahead of the horse. You first need to figure out what you have. I'm pretty certain that you do NOT have an SVD. You're about 2 grand shy of real SVD prices.
You MAY have a Tigr, which is a commercial copy of the SVD. IF it's a Tigr, it is a great price.
You MAY have a PSL. If it is a PSL, it's a good price.
You MAY have an SVT. If it is an SVT, you're about the going rate, depending on condition and specifics like matching parts, etc.
The SVT is nothing like the SVD, Tigr or PSL. It's a completely different rifle. The SVD and the Tigr are "designated marksman" style rifles built off of a common receiver. The PSL is a combloc rifle built to perform the same role, but is built off of a different receiver (closer to the AK than the SVD). SVDs and PSLs have good accuracy, considering what they are. They are not "sniper" rifles. They're designed to provide an infantry unit with the ability to put accurate fire on a target at a range in excess of the practical accuracy range of the AK. So, if you're expecting sub MOA groups from any of them, get used to disappointment. If you expect torso shots at 500 yds, you're probably good.
Mike