Haircut - short or trimmed?

Now is the time for me to get my hair cut. (pic to upload shortly)! I usually get it cut twice a year but now I've really had enough of it. I was thinking of just shaving it all off! Not a no.1 but more like a no.3. I've never shaved it all off before!
Going on holiday in a few weeks time and need it a lot shorter for the hot wweather there and here.

Any suggestions or links to hair websites or pictures? (serious ones, please guys)?

Thanks forl istening and I promise to have a pic up shortly and maybe have like a before and after shot!