I would size the pack to suit your airborne electronics and your flying habbits. I think the 800 should be fine for a day of scale flights with standard servo's, etc. in the Snipe. Obviously more is needed for large high torque servos in larger planes that are flown longer and harder. Larry at SR can certainly give you good advice here. The charger you reference has a minimum rate of 250ma which is C/3.2 (250ma/800mah), which I personally think is a tad high for regular use with a rx pack (it might make a good field charger at a higher rate, say C/1, if you have electric service at your field). I'm not an expert in charging and might be overly cautious, but for longevity of the pack, I'd skip the peak chargers and just trickle charge at C/10 for 15 hrs (80ma in the case of the 800mah pack). Sometimes I'll cycle faster for a capacity check, but regularly charging faster with peak chargers was "hitting 'em a bit hard" according to the folks at SR. It's fine for electric motor batteries (which generally don't live as long, and have ESC/BEC eliminator circuits to bring the plane down when the battery gets low), but not a great idea for rx packs which give you no warning when the voltage gets too low in the air.