Thank you very much for all the comments and input and I reckon initially I was overpowered with the choice and options, I had been thinking ooohhh disco and pulse (others call it 'throb' and bloody good description that is) but now that I have been out and using it I also checked the feedback here and went with 3. Flashing! A few have commented about disco and possibly legal about flash rate - and again the options are tempting but all I want is to be noticed and I think it's 3. for me.
I do reckon we live in an age where there's so much choice available - we're concrete consumer machines like it or not but jeeeyz, everythign does get complicated at times. I like simple and effective, robust and effective. function over asthetics etc. but great lights - the choice is always good but sometimes I'm a luddite and stick to what I know.
Thanks again!