I would say a cherry MX keyboard, brown keys. And yeah, the G400 is a nice mouse. Doesn't look out of place in an office. 
The Qpad doesn't actually look bad and flashy. I have the MX-85 with browns, the backlit version. The layout isn't weird either. Feels like sturdy regular keyboard with a nice positive key action, and nice features.
YOUR BASKET
1 x 
Qpad MK-50 Mechanical Gaming Keyboard - UK Layout - Brown Switches ** FREE MAX PAYNE PC GAME **  £64.99
1 x 
Logitech G400 3600DPI Gaming Mouse (910-002279)  £23.99
Total : £99.48 (includes shipping : £8.75).
 
  
Correction : the MK-50 doesn't have the USB hub, or the audio hub. It's basically the MK-85 shell, with the ports blocked. hmm... But there are a few options for mechanical keyboards that are better suited to office environments (Cherry does a few).
for example : 
YOUR BASKET
1 x 
Cherry G80-3000 Mechanical Keyboard  £64.99
1 x 
Logitech G400 3600DPI Gaming Mouse (910-002279)  £23.99
Total : £98.88 (includes shipping : £8.25).
 
  
Problem with mechanical, is the noise. In an open floor office, probably not a good idea. In a closed office, no problem. 
Keyboards like Apple's are much quieter. I quite like the Logitech Illuminated Keyboard, it's low profile, so typing is a different experience, but still found it very satisfying.
YOUR BASKET
1 x 
Logitech Illuminated Keyboard (920-001165)  £56.99
1 x 
Logitech G400 3600DPI Gaming Mouse (910-002279)  £23.99
Total : £90.88 (includes shipping : £8.25).
 
  
 
Try before you buy, if he doesn't like low profile keyboards.