The prices you've been quoted from valeters is about right imo, personally I would charge around £140-£150.
Some comapnys base it on about £20 per panel.

Judging by the pics, theres nothing you can do with the bad scratches might be able to hide them a bit but will still show.
The other light scratches you can get out if there not too deep.

Can do this by wet sanding with very fine wet and dry, and then compounding or maybe even just compounding if they are very light scratches.