I've been a nurse for 17 years, starting out on a med/surg floor, then migrating to Cardiovascular. The one year of Med/Surg gave me a solid foundation to build on. Most non-surgical, non-traumatic ICU patient's are in ICU because of a Med/Surg condition gone bad.
There's so much to learn on Med/Surg and it will help you to find your true 'niche' in nursing.
Good luck to you on whichever road you choose!