I always try to pick models that are a bit inspirational. So anything Fleet Air Arm, British 1939-1969 or ugly/a bit unusual. Having said that, I have a half-built Sea Fury that I have nothing but apathy for. I started it a while back, got a base coat on, and have had no desire to work on it since.
I am rather excited about payday though, as I will be exchanging my readies for a Revell 1/72 T-2 Buckeye (it's naval, albeit American) and a Smer Amiot 143 (do they get any uglier?). Also got a Gannet and a Novo Gloster Javelin in the stash, both of which I am looking forward to, even if there is a certain amount of trepidation about taking on the Javelin!
Take a deep breath and go for it....you'll do ok!