If you shoot PRS, speed matters more than absolute accuracy - you will turn your magnification down to 10 or 12x. You do this in order to get a wider field of view so you can acquire targets quicker. If you shoot in very hot weather or over sand you may be forced to turn down magnification in order to reduce the distortion introduced by mirage. I have shot in mirage so bad that you could see the target only about half the time, the other half it simply wasn't there at all - that's a tough situation with fixed power 40x scope. If you have more time and don't have those problems, you will probably turn your magnification all the way up. In my opinion, the primary advantage to a first-focal-plane scope is that the reticle tick marks always mean the same thing - the 0.2 mil tic always means 0.2 mil. This is an advantage when shooting PRS or other events where speed matters. You can set the magnification where it suits the event the best, estimate you wind call, then hold using the reticle. With a second-focal-plane scope, the 0.2 mil tic is only 0.2 mil at a specific power. I find that difficult, your mileage may vary. Keep in mind, when you turn up the power on a FFP scope, the reticle lines get fatter. Depending on your reticle, that may or may not be an issue.
If you can bump your budget by $1,000 you can get a lot more scope. A used 5-25x or 6-24x Kahles with a Christmas tree reticle is a very nice piece of glass. I also have a $1,300 bushnell tactical that is not high-tech - I think it is 3-21x, FFP, 34mm body, no zero stop, no illumination. I'm not recommending the Bushnell but you can do some good shooting and get some good training with a mid-priced scope - just remember its limitations.
