If you're considering buying a router table for cab use, it will more than likely be a waste (although that is not to say you shouldn't get one).
What you'll be using your router for on your cab:
T-molding groove
flush-panel bit to create an exact match for cab sides
perhaps some small marquee work
Joystick/button holes
For everything EXCEPT the possible marquee work, a router table will be more of a PITA than anything else. You're simply NOT going to be able to manage 2 sheets of material on a router table when trying to make identical sides, so no dice there.
Same principle when referring to the t-molding groove - more cumbersome than it'll be worth.
Joystick/button holes - you're better off drilling them or using a jig with your router - a jig for this use isn't going to work any better with a router table than freehand, but it very well may end up working WORSE.
That leaves some marquee work (or perhaps some brace work for a monitor or what have you). Those will be small pieces, and will be far easier to deal with on a table than freehand. Freehand, those pieces could actually turn into a nad-crusher/remover. Seems that L-bracket or U-channel is used for most marquee work though, so unless you're wanting to make an all-wood cab, you won't even need the router table for THAT!
IF you think you're going to want one for projects in the future, BUILD YOUR OWN! Cheap ones are small and lacking in features, which makes them a waste of money IMO. Larger ones are far more expensive and CAN be worth it, but if you're asking this question, odds are good you need to do A LOT more router work to know what you're looking for in one of these types of tables. Also, many of the tables you can buy can be built for about the same amount in basic workable materials, with gadgets and geegaws adding a small amount to that price - building it makes it possible to customize it to YOUR use, something that's not practical or even possible with store-bought tables. Finally, many cheap table manufacturers (the type you're more than likely looking at due to cost) skimp and save money by having an "open" table - kind of a "spider web" table further away from the bit. Something that not only is annoying (looks cheap IMO), but can be EXTREMELY unsafe if you catch your material on an edge of that spiderweb or a piece gets trapped in there, making your routing process more difficult than it needs to be.
Build your own table if you want one, and build it before you start your cab. It's a small enough project that'll give you confidence going ahead with your cab.