I really don't know. How can there be such a HUGE difference?
I see your point, is this just to buy it or have it put up by someone?
If your doing it yourself, go for the cheap one. You can afford to replace it three times.
Or get a sample!
Oh Er, Well quote 3 sounds like a no, quote one sounds desperate, which might mean he gets no work cause he's not very good. Thats leaves number 2.
Dont have a go if the advice turns out duffer though
middle
i always tried to put in the middle quote ,it allows for the unexpected and allows for a profit .
either side of the deal the middle quote is safest