FAILED KEYS

[DW.]

While playing doom iv found some of my keys are beginning to become unresponsive .
Its a logitech g15 the one with the fixed screen.

I do like these two.
My basket at Overclockers UK:

• 1 x Asus Cerberus Black Gaming Keyboard= £49.99
• 1 x Corsair Gaming K40 Keyboard (CH-9000223-UK)= £54.95

Total: £115.44
(includes shipping: £10.50)
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But the question is. Whats so special about this one.
My basket at Overclockers UK:

• 1 x Asus Strix Tactic Pro Backlit Gaming Mechanical Keyboard - Red Switch= £114.95

Total: £125.45
(includes shipping: £10.50)
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and then there this one.

My basket at Overclockers UK:

• 1 x Corsair Gaming K70 Red LED Cherry MX Red Mechanical Keyboard (CH-9000114-UK)= £89.99

Total: £99.89
(includes shipping: £9.90)
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[DW.]

what type is the Logitech ive got?

http://support.logitech.com/en_us/product/g15-keyboard

Which board would best suit my needs.
i don't like the feel of the space bar on this keyboard it wobbles about because its mounted in the middle