I'd like to recommend Nevada in Portsmouth.
[url="http://www.nevadamusic.co.uk/"]http://www.nevadamusic.co.uk/[/url]
I've been going in there for 25 years and I've always found the staff to have a very good attitude.
Range - 7 - They are not a dedicated bass shop so they have a bit of everything, guitars, keyboards, drums etc., but they usually have a big selection of low to mid priced basses and a few top end Fenders, Musicmans and the odd Ric.
Price - 9 - Their prices seem to be competitive with most other shops. The online prices are similar to GAKs online prices.
Service - 10 - Excellent. Always helpful, enthusiastic and friendly. Some of the younger staff can be a bit clueless about bass but there is usually a bass guy around if you ask. I've never been pressurised or hassled in any way. They are always willing to let you try stuff out and they have two demo rooms where you can sit and noodle in private.
Since they have relocated to an industrial estate outside of the town there is always loads of parking.