What would be the best replacements for the minimi and minigun if we only use CS weapons and don't create new ones?

ummmmm........... M249 or dual P90's?

Hmm... that's a hard one. CS doesn't really have any sort of weaponry similar to the minigun. You may just have to make it a made-up one or just leave it alone. I don't have CS:S yet so I dunno if source has anything that would fit your needs. Whatever. Good luck though, look forward to seeing the CS mod! :)