Maintaining weight once you have reached your goal....

I have been dieting and running for going on my fourth month now, I am at my desired weight and feel good but now I am wondering where to go from here. I have been at my goal weight for 3 weeks now and am still on the same plan of 1233 calories per day, which BTW is not easy in that I find myself coming up short in my calories quite a bit. I feel maybe I should bump the caloric intake up a bit to help with energy especially on my 5 mile runs.....Any thoughts, experiences or advice ?