You have a classic nice scope, and yes, optics have improved, but Leupold Mark 4 has never been a bad scope. The only downside is that the lower magnification is rather high. I would try it and see how it works, and what magnifications you need in PRS. I would also see what other shooters are using, and then think about your budget.
Strike Eagle is a balancing brand for Vortex. It is good enough, generally, while still being a budget scope. There is a big jump in quality from Strike Eagle to PST Gen II and then to Razor Gen II/II HD-E. For most low power (up to 8x) and the mid-range (up to 15x-ish), the Strike Eagle performs well. When you jump to 25x, you are asking a lot for a budget scope. Not that Strike Eagle will not handle it, but I bet you see a better image with an Arken at 1/2 the price. If you are good with 6 to 10x max, you might even try the Sig MSR series, which packs a lot of scope with a mount into a budget price, and good BDC reticle.
I would just encourage you to take it slow. Most of our PRS shooters are spending more, but are getting mid-range 15x, 18x or 20x maximum, but that is also preference.