Are you planning on taking the CPA exam or making a career in strickly the accounting field? Asking before I can really offer some advice.
I graduated from undegrad in '97 and didn't start grad school until 2002. I really do feel that having real life work experienced helped me GREATLY because in my MBA program, we were covering topics that I had actually worked with in real life - it wasn't just a "theory" so to speak.
I worked in my field full-time and went to grad school and it WAS HARD. I basically had no life (lol). I did feel that having a MBA (and from a good school too) did help me - I got a new job with a plus 10K salary increase (and I wasn't doing bad in my current role either) in the field that I wanted with the responsibilities that I wanted too.
If you current company is offering a tution reimbursement program, I'd seriously consider it.