Guy, before spending your hard earned cash, ask yourself "what areas of my photography are lacking?" Determine what you need before you decide on what you want. Do you find yourself trying to take photos with your current kit and constantly think "I'm not close enough, I need more reach"? If so, then a telephoto lens may well be of use. If not, then why spend your money on something you've never had a need for?
If you're not used to a 500mm lens then it will be a bit of a shock and require some (LOTS) of practice to get the best out of it.
If you've not been needing to get ever closer, then a new monitor may well be helpful. Regardless of this decision, if you don't own a monitor calibrator, that is an essential bit of spend before you decide on anything else.
It would help to know what equipment, both monitor and lenses, that you currently own. This will help others in advising you.
Duncan
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