Car hire - I have used most of them over the years!
Auto reisen generally my favourite. Holiday autos have generally been the cheapest and cabrera medina have the best range if you fancy getting something different.
Make sure you use a comparison site for the best deals
http://www.kayak.co.uk/ is good - for the week starting 1st March was coming out at £90 for the week.
Never had them playing silly beggars with charges - just make sure you check with them what the petrol situation is. Sometimes you get it empty and sometimes full.