Stage IIA which is what it sounds like you are and what I am. I opted for FOLFOX. These #s are for T3, Low grade, 49 or younger from the mayo clinic - it is slightly different for over 50:
5 yr recurrence free survival:
Baseline (no chemo): 73%
Adjuvent 5-FU: 77%
Adjuvant FOLFOX: 81%
5 year overall survival:
Baseline: 83%
5-FU: 85%
FOLFOX: 87% (86% if over 50)
These are the same numbers my oncologist used when I met him. I took a couple of things from this. FOLFOX increases the chance of no recurrences in 5 years. Going through a recurrence would be traumatic. If I got a recurrence and did no chemo I'd be really pissed at myself for not having done chemo since there is a chance it would have helped. I am only 42 & have 2 young kids so I wanted to do everything I could to improve my odds.
The change in statistical survival are small percentages and the statistics are not exact - there is a margin of error like in election polls, but I chose to accept the statistics as the best numbers I could get and thought about it in fractions.
No chemo: 1 in 4 chance of recurrence, 1 in 6 chance of dying w/in 5 years.
FOLFOX: 1 in 5 chance of recurrence, 1 in 8 chance of dying w/in 5 years
I also thought of it as being forced to play a game of Russian roulette sometime in the next 5 years. I decided to do everything I could to be handed an 8 shooter instead of a 6 shooter.
On the flip side 73% of people who do chemo for stage II are being treating for no reason. Oncologists disagree on the course of action. One oncologist I spoke to was very much in favor of chemo and said if you do chemo do the best available - FOLFOX. Another presented it the same way as yours - there is just a small percentage change in survival. You should also look at how well FOLFOX works in Stage III patients - I accept this as evidence that FOLFOX does really work.
You can get your statistics here:
http://www.mayoclinic.com/calcs/colon/index-ccacalc.cfm
How to treat Stage II patients is a controversial topic in oncology.Unfortunately you need to make an informed decision on your own. I'm 6 cycles into FOLFOX4 and am a computer programmer and for me it has put my work & life on hold due to "chemo brain". Chemo has not terrible but hasn't been a piece of cake either. Everyone reacts differently - some have an awful experience, some are in the middle like me, and some breeze thru with almost no problem. You can always start and then stop if it is too tough. I read somewhere in an oncologists debate on adjuvant chemo for stage II patients that some oncologists believe getting even some FOLFOX is better than none. Good luck no matter what you do.