Don't worry what everyone else has
In the past it was more of a toss up, but fuel prices have gone down and FI systems have actually got cheaper relative to Carbs which have not dropped in price, keeping up with inflation. My guess is competition of FI systems between Bendix/Precision, AFP and now ECI keeps price competitive.
Carbs are a single source Marvel Schibler (now Precision Airmotive Corp). Also rumor has it (I think there is some truth to it) the long run of Carbs and lawsuit liability with so many Carbs in service, today's price has to cover and absorb the liability. AFP's and ECI's have not been around or sued enough.
The big selling point of the FI is fuel economy, specifically in cruise. With gas prices that is even more valuable. In the past FI would not pay for its self very fast when gas was cheap, but now saving 0.50 gal an hour or what ever adds up. espcially at +$4.00/gal
HOWEVER, you have to be a clever operator and move that red knob very judicially to get max advantage out of FI. If you are lazy and not attentive to power and mixture optimization (minimization of fuel flow) it does not matter what fuel delivery system you have, you will burn more fuel than your hanger neighbor with a carb, who watches mixture and power like a hawk.
However if you can dial-in the FI (even flow out of injectors), using the FI system to its most advantageous AND you cruise a lot, you can save $$$$. However cost, build time will be higher initially, and even maintenance may be higher initially, but with the fuel prices pay back time will be much shorter. Depending on how you fly that might be 5 years or 20 years?
Don't worry about resale, but FI is thought to be a nice selling point or feature. I think HP and constant speed prop are higher up on the want to have list.
Don't worry what everyone else has. A 150HP, Carb, fixed wood prop RV is a rocket and fun fun fun. Fuel Injection does not make the smile much wider. The economy aspect will take many years of flying to pay for itself in gas, but still its a good thing and gets better with worse fuel prices. With that said if buying a new engine today I'd buy FI just because it CAN meter fuel a little more precisely.
Bottom line if buying a NEW engine get FI, because the price is not much greater. If buying a used engine with a Carb, stick with that. Also don't go broke building you plane. There are things you can add later, like going from fixed to C/S prop. However FI is something you want, you should try to go with from the get go. Converting is expensive and selling a used carb is hit and miss.