Always ridden modern aluminium framed road bikes,fancy a retro look steel framed bike for a change,like the look of them !!,i'm 6ft tall,would prefer a bike with sti levers but not neccessary if poss, have a budget of up to £400.00 ish,what brands of bike can i expect to get for around this price,what type of tubing should i be looking for as i don't understand what the numbers mean i.e 531 etc as i'm new to the retro world of bikes !!.