the v5 is agreat mod- it has the removable top cap (unlike the v3) which makes it easier to clean. it has the new firmware and the display screen shows the battery level which is a nice upgrade. i have both(along with some dna20 mods) and i use the v5 more than any other mod i own. it feels great and has never let me down.
as far as charger, i have a 4 bay xtar and it has proven to be the best charger of the many i have owned- as a plus it charges not only the lithium batteries i use for e-cigs but also charges nimh batteries and i have a ton of those for use around my house. you can mix and charge independently in any bay which makes it versatile.
while i have imr batteries, with the v5 and other regulated mods i have no problem using any good battery. the v5 has all the protection built-in with the circuitry on board. go for higher mah ratings to have a longer vape between changes. the panasonics with 3100 or 3400 mah last a really long time....
all-in-all the v5 is a nicely priced , rugged, and good looking mod that will last, and what else do you really need? over time you may WANT other devices but you won't NEED anything else.....