Get the mouse, skip the keyboard. That goes for either setup.
Gaming mice generally have better sensors than their non-gaming counterparts, which makes them a better choice for accuracy and precision. Despite what some people insist, I can easily tell the difference in tracking quality going from a generic Logitech optical mouse to my G500. They also tend to have better mouse feet, and features such as adjustable weight, adjustable DPI, extra re-assignable buttons, etc.
Gaming keyboards, on the other hand, only offer a few useful features, and often skimp on what matters most - key quality. Colored backlighting might be a nice thing to look at for a while, but it gets old fast and doesn't really help much. Macro keys go largely unused (in my experiences), and the LCD is a neat thing for a while, but I can't think of the last time I really used it on my G15 (first or second gen). For that reason alone, my G15 is sitting in a box in the attic, while my Logitech Illuminated Keyboard gets used daily.
If you want a GOOD keyboard, look into something with a better switch type than mushy rubber domes. Scissor switch keys ("laptop keys") are a decent choice if you like the laptop feeling. Otherwise, I recommend Cherry or other mechanical switches, which are offered in a number of different keyboards - Das keyboard, Deck, Filco, Topre, etc. Expect to pay a lot more than your average keyboard, but the price should still be in line with the G19. Again, you're getting MUCH higher quality key technology than you would with the G19 and it's rubber dome setup.