Which Forte, and which RF-7 model? There's A LOT of used Forte I and IIs out there for sale, and they are generally a great bargain. I'd lean towards the tractrix horn and larger radiator found in the Forte II, however. RF-7s are also out there, but less so. A decent bargain used, but like I said, I'm not a fan of the crossover. If you're looking for something new today, the RF-7II is a fantastic speaker, hard to beat, and can be found below MSRP, usually.
I'd be very surprised if the RF-7 III and Forte III don't sound fantastic as well, but they'll likely sound different, both from each other and previous generations, which is something you'll want to audition for yourself.