I agree that Saga are good, so are NFU, the CC and the C&CC.
A good independent broker will be able to give you the low down on strength claims history etc.
I do not deal with General Insurance but would ask if the company has a call centre - if yes think carefully!
If this is not in the UK say no! We are getting a number of reports where peoples identity is "cloned" after their details are dealt with by an offshore call centre. I find it bizarre that we are all protected by the Data Protection Act in the UK and EU but as soon as your data wings its way offshore - no protection at all!!
Also DO NOT use a firm that advertises by leaflet in magazines! Not allowed to mention the main one here but it is known as *&*.
Personally I have found NFU excellent, as is the CC for general admin and help on the phone. However, I have never had to claim.