Hello again chopper.
I am in the exact same situation as you, got £500ish to spend, am very tall and have big feat

(Which makes driving the mums punto a right PITA).
I too love the foucus (started learning in an 07 and driving instructor took delivery of his 08 a few weeks ago which is also lovely). However focus is going to be my second car becuase they are a bit to expensive for me right now.
However for me Mondeo 1.8 LX '97 blah blah comes out at just over 3k on the old insurance.
In my research (through getting actual quotes, not just going by insurance quotes) the following have been cheapest for me:
106
306
Saxo
Corsa
Ka
Those are the only cars that come under 1.8k for myself.
Insurance wise, Direct Line and Tesco offer me the best fully comp prices. And eCar offer the best TPFT prices.
Quite chuffed, now I work at tesco I get a 15% reduction on their insurance which is always nice, however that kinda negates the fact they are like 20% more expensive than ecar for myself! but on the upside they do not charge any extra if you want to pay via direct debit which is a nice touch.
Good luck! Still no idea what I'm gonna get for myself, got to the point now where I really couldn't care less. Just 4 wheels and an engine! (and sub 3k inc cost of car, insurance, tax, mot and maintenance for 12months)