Steve,
Pat's and Carl's advice is spot on. Like you, when I built, I wanted a balance between reasonable performance, value, and follow-on marketability (for the airplane or individual components). I couldn't yet afford a CS prop, so I opted for the IO-360 with a good FP pitch. I took advantage of the 2012 Van's Sun 'n Fun engine/prop combo sale, and purchased the YIO-360-M1B with the Sensinich 72FM8S9-1(85) experimental prop. Great prop for cruise speeds, and reasonably OK for all the other stuff (takeoff, climb, aero, etc.)
About the Van's Sun 'n Fun deal: FANTASTIC! The engine ships to you bagged/pickled for long-term storage, for they recognize that you're probably not ready to install the engine so it'll need to sit a while. The prop/engine combo saves 1-2 AMUs (aviation monetary units), and that year the shipping was free. I saved another several thousand dollars by buying the non-certificated engine: It's factory new right off the Lycoming line, and even has the same warranty. It just doesn't come with a $6-7000 piece of paper saying "certified".
Now, 250 flight hours into this, I'm ready to expand the airplane's performance curve, so I'm buying the used Hartzell C2YK-1BF CS prop off Dan King's RV-8 BEAUTIFUL DOLL. This prop is the classic Van's-preferred matchup with the RV-7A / IO-360 family.
Bottom Line: Either way, you'll build a fantastic machine. I do recommend sticking with the (I)O-360 family just because to me it's what the airplane was designed for, most buyers expect, and easy and enjoyable to fly. Plenty of buyers will want a FP prop for the simplicity/cost factor, so you won't have trouble selling it IMO. Same applies for a CS prop: Much of the market will prefer it over the FP. Either way, you'll find buyers.
BTW: In about 2 weeks I'll list my FP Sensi prop here on VAF, along with the spinner and front/back plates (already fitted to each other), and the spacer and bolts. All you'll need is a 360.