That's very personal....  The types of stroke deliver different  feelings, some like the click sounds, softer or harder rebound and etc; besides, the keyboard manufacturer might moderately adjust the sensitivity of key stroke.

Personally, I think Red and Black are very nice for gaming, and I mainly play FPS and MMO type games.  Still, it's personal :)

Upgrade

No. 1 - Graphic Card - For higher gaming power

No. 2 - Power Supply - 400W+, better with bronze rating, to support the new graphic card

No. 3 - SSD - A 128GB SSD can load your OS & core software, and improve the overall performance

No. 4 - Gaming Keyboard & Mouse - base on the genre of game you like

The sequence shows the priority of importance~