They go for £300 - £400 mark - as you point out they aren't as sought after despite being of a similar quality and as playable as any JV. Collectors prefer the JVs as they were based on the original Fender vintage blueprints, the SQs are more of a 'mash up' of models e.g. 70's style tuners, solid barrel saddles, skunk stripe, etc. I'd keep it I'm sure it's value as an instrument outweighs its monetary worth.