What size Reverb?

Right I'm after a Reverb for my Nukeproof Mega AM but wondering what size to get. I'm 6'4" and ride an XL frame with the seat quite high when climbing so thinking of going for a 420mm with a 125mm drop. Any other taller riders who use a Reverb who can give me some advice?
Cheers.
Cheers.
__________________
"I keep getting eureaka moments ... followed very quickly by embarrassment when someone points out I'm a plank"
Scott Genius MC 30 RIP
Nukeproof Mega AM 275 Comp
Cube LTD Rigid Commuter
Ribble 7005 Sportive
"I keep getting eureaka moments ... followed very quickly by embarrassment when someone points out I'm a plank"
Scott Genius MC 30 RIP
Nukeproof Mega AM 275 Comp
Cube LTD Rigid Commuter
Ribble 7005 Sportive
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Only reason is I didn't realise they did 150mm drop :oops:
Thanks Rockmonkey, thought I'd need the 420mm. Will get it with 150mm drop
"I keep getting eureaka moments ... followed very quickly by embarrassment when someone points out I'm a plank"
Scott Genius MC 30 RIP
Nukeproof Mega AM 275 Comp
Cube LTD Rigid Commuter
Ribble 7005 Sportive