Thanks guys for all your input. It is much appreciated.
I have narrowed it down to the Dereelight C2H and the RRT-0. As much as I love my TI Quark's I was lucky with them and got fairly white LED's. I do not want to run the risk of getting a green tinted LED
From reading the reviews both the C2H and RRT-0 are great lights but at this stage I am I am leaning towards the C2H.
The C2H has less working parts (as cool as the ring is I can do with just a clicky and one less thing to go wrong), is slightly shorter and cheaper (I can use the extra $$ to buy some new RCR123's). However my main aim was to get a EDC which for 80% of the time I run on rechargeable 3.7volt RCR123's and if need be, screw on the extension tube and throw in a AA. However there is a over-discharge protection (which I don't understand fully how it works) that I don't think will allow me to do this. I have emailed Alan to clarify...
The RRT-0 on the other hand is super cool, has an excellent build quality but is a bit more expensive.