£200 bike for a 7yr old boy?

Looking to get my little boy his first proper bike with gears, not bothered about suspension or anything like that, just want something easy to use, reliable and relatively lightweight.
He's just over 120cm tall, so I'm not sure whether to get him a 20" or a 24" wheeled bike, I'm going to get him to sit on a couple of each to see what he's comfortable with, but a little advice from the knowledgeable people on here wouldn't go amiss either!
Any recommendations please? Cheers.
He's just over 120cm tall, so I'm not sure whether to get him a 20" or a 24" wheeled bike, I'm going to get him to sit on a couple of each to see what he's comfortable with, but a little advice from the knowledgeable people on here wouldn't go amiss either!

Any recommendations please? Cheers.
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http://www.islabikes.co.uk/
Road - Wilier Izoard Centaur/Cube Agree C62 Disc
Allround - Cotic Solaris
Looks nice either way, thinking black looks better - http://teamsky.frogbikes.com/lightweigh ... rog55.aspx
was up for £250 but i managed to get it for £215 in the end.
after lengthy talks with the chaps in there i decided not to go for the front suspension specialized as it was half as heavy again as the cube, and also at his weight would do absolutely nothing. its a gimmick on kids bike and a waste of weight. just let a little air out the tyres if its really bumpy.
i had also considered the frog bikes, as a friend got his son one and and my lad had a go on it, but there are no dealers that i could find around our way for him to go and try one.
here is the one i got my lad from hargroves, looks the same as the frog, probably made in the same place with the same components, just a different colour lol
http://www.hargrovescycles.co.uk/cube-k ... -bike.html
http://www.halfords.com/cycling/bikes/k ... ke-2014-24
...was well impressed with price/spec/weight (paid about £140 with some stacked codes).
I also cant believe that i spent the best part of 3 hours wrapping his present for him last night!
Can you tell what it is yet?
And yes, he is a lucky little monkey. But he is worth it!