If your just staying on SR then I would definitely go with a Volt. I have 4 Volts and I have found the battery life is pretty damn good. I have also found the only carto for the Volt I really really like is Smokeless Images blank carto's, a little on the pricey side but if you use the 10% discount code or load up on their sales. I found other carto's just don't compare on the Volt. The flavor and TH on them are perfect. Just an FYI if you get the pcc dont screw the battery's to tight cause I broke one by twisting it a tad to tight. Their pcc's are not brittle but they aint strong. Battery life, good carto's, and superior customer service and shipping have me always coming back to SI. The Volt is a great cig size PV!
P.S. I rotate a couple manuals at home and a manual/auto combo when out and about for driving and at work.
P.S.S Horizontal coil carto's like SI's are the only way to go on 808's.