I would say that before you consider all offers, you should be aware of your circumstances. Are you integral to your current company? Do you have an open relationship about your career with your current employer? Do you like your current job? Are the benefits something you think about regularly (4 weeks leave time, work from home, fully covered health insurance)?, having researched pay for your level of experience, where are you? (knowing this is critical). If you're on the low end, ask your employer why. If you do get offered a new position, is "total compensation" better (salary - taxes, medical, dental, leave time, additional benefits)? If offered a bonus, remember you have to pay taxes on it.
I tend to agree with the rule "don't entertain counter offers", but if you think you may get one, discuss it directly. A lot of employers will be very honest about your total comp and why they level you there. It's often about their own costs, their own "grid" of salaries, and because they have a "system", they can't really pay you more unless you're promoted to management. It could be about you and if that's the case, they probably view you as expendable and you should almost certainly move on.
Whatever you do, try to minimize the emotions and focus on all of the tangible aspects.