I do Survival of the Fittest at Nottingham most years really enjoy that one, although this years version was tainted by a bee sting at 4-5k which developed into cellulitis the following day and the loss of a contcat lense at Holme Perrepont which meant I ran half the race half-blind.
I have done the VOTWO Kamikaze in Dorset; needs a weekend away from where I am and has more running than obstacles.
I did the Total Warrior 10 miler last year, had a long weekend up in the lakes to cover it. Really enjoyed the race. The organisation was good; fantastic atmosphere with quite a few teams in fancy dress. As a bonus there is a New Balance factory outlet in Shap.
You're righty about the tough mudder; over the top pricing.
I'm thinking of doing the Midlands Super Spartan on 8th September.