I also use a pump + C02. The two most highly recommended are the Road Morph and the Lyzene that two folks here showed. My C02 is kept in my saddle bag. With a few tests I learned that if I pump 20pumps from my Lyzene into my 25c tire I can then top it off with a 16gr C02 cartridge and I'm right at 110 lb. The weight of the Lyzene is so small that unless you are racing it simply has no downside. C02 is really helpful to keep you from holding everyone else up and the pump ensures you won't ever be embarrassed by running out of C02. I've used all my C02 cartridges helping OTHER people. One person who fails to actually repair their tube and boom! You've used up 2 cartridges.
BTW....C02 will diffuse through the inner tube much more quickly than regular air does so whenever you use it you need to bleed it out and pump "for real" after you get home.