If you can get more money for the same job, take it but bear in mind there will always be someone somewhere talking about how you are a greedy Barsteward and you are showing no loyalty and you should be ashamedc of yourself. (shithappens)
Then go for it One move after not too long in a job won't look bad on your CV, but if you do it 3 or 4 times then potential employers will start to be a bit wary.
Phh! I have never stayed longer than 18 months in a full-time job yet. I reckon if you spend too long in one job then it becomes far too comfort zone. What do I know though hey? I only posted a reply really cause I didnt want my profile deleting!