You're a college student that currently uses "whatever string your coach buys". Is it that you don't like the string you're being supplied with? I'm asking because you didn't indicate whether you did or didn't. If you do, but you're simply exploring other possibilities, that's fine, too! Again, I was just curious.
As for natural gut, if you're a typical college student you probably don't have the funds to spring for expensive string, which includes NXT and NRG² (although NRG² is the cheaper of the two).
Start with affordable synthetics and work your way up. With string the old adage of "you get what you pay for" doesn't apply. It's about what feels good to "you". It could be that a string such as Pro Supex Spiral Flex (very inexpensive) is pure gold for your game or you might find that Mantis Power Synthetic, KLiP Scorcher or Alpha Viper MXT (a little more expensive, but cheap compared to high-end multis) is more to your liking.
There are LOTS of strings out there, and the number of choices can be daunting to say the least. Do a little research, start low, take your time, and good luck!