Carbonation is very much a personal preference, I would tend to batch prime with 80/100g for bottles as I don't get too hung up on it.
I don't user straight sugar, I tend to use dry malt extract (light) or brew enhancer in the same quantity... just because If I am being picky about yeast/water used then I don't want to have any possibility of causing any "off" flavours at the final hurdle.
Most people would tell me that it's completely pointless due to quantities used etc but for £4 per bag doing 6/7 brews it's an extra 58p per brew. Not exactly breaking the bank.