It's good to mix high profile big races with tiny little small field races I find.
This year I've done the Great South Run, £40 to enter, 17,000 runners, and a tiny little village 5k with 100people. Also currently doing some XC races that are free to club members.
A nice little mix.
Although in fairness I got the GSR free 
Edited: 14/12/2012 at 19:37