RECLASS TO 25B or 17C?

Think about what you want long term and work towards that. It may require working in your current job for a while. Run towards something, not away. I have Reclassed a lot of people who just wanted out of their current MOS and they came to find they didn't love their new MOS any better.
You can find information about 17C on their website but with no prior experience you might not be very competitive. Realistically, you probably have no chance.
If you are interested in IT you should work on your degree while you're in the Army. Take advantage of the fact you're getting a full time job with excellent benefits that pays TA.

If you qualify for both, 17C is the horse that's running right now, although those are probably coming from 25B/N land.

From My experience in the Army Reserve in and out of deployment.
25B = Mostly a Help Desk Technician /Server Administrator.
25U = Technical Subject Matter Expert in Computer Information Systems, Information Technology, Communication equipment and power distributions.
17C = Reading/ciphering net scan Logs and packet captures for vulnerabilities. Also a lot of coding with full or no rights/permissions.
25D = Certification and Accreditation for IT equipment and software. Also a lot of coding with almost no rights/permissions.
17C and 25D is only a hear say for me, but I have civilian equivalent experience for those 2 MOS's and it could get tedious and feel not-so-fruitful at times.
All above MOS's have their ups and downs, but choose wisely, at the end of the day, what is the most fun and rewording for you is the best choice. They will train you and can get you certified, but you need to be passionate about the job is what will get you through the day.
One good perk for 17C and 25D is you have greater chance to get Top Secret / Sensitive Compartmented Information (TS/SCI) clearance, which is highly sought after.