i meant the keycaps for the bottom function row of both razer and corsair are non-standard. means the sizes of spacebar/alt/option are different from normal standard keyboard layout. which means when you want to find new novelty/colourful keycaps to replace the stock keycaps, you're gonna have a hard time (probably paying more for it)

on a side note, imo razer boards not really good in terms of durability... many encountered dead leds/switches issues (ahem 80 million keystrokes) just google about it and you see many threads opened up in various forums.

with a budget of 700+ (for razer blackwidow chroma v2/corsair k70 speed) you are actually open to many other better options like ducky/cm storm.. probably even at a cheaper price for their rgb counterpart.

if you want your browns/reds to be more silent, you can consider putting o-rings dampeners onto your switches

My Blackwidow ultimate i think i bought in 2012...
Use until now also no issue. Not a single LED burn also.

I prefer standard keycap for typing. The keycap on the razer feels abit...small...dunu why (or maybe the spacing of the key itself).
My fingers are quite large so i always miss type stuff. Gets quite annoying. You might find this to be an issue if you are looking at Corsair/Razer.