There's plenty about for that sort of money.
If he can squeeze a touch more out of the budget the 2011 Mongoose program is a nce bike and very reasonable, also has an old school flavour
http://cgi.ebay.co.uk/Mongoose-Program-2011-BMX-Bike-Gum-Rubber-NEW-Boxed-/310324111247?pt=UK_Bikes_GL&hash=item4840c2278fotherwise look out for we the people, there are lots out there and they seem to sell pretty cheap second hand, good strong bike with street respect. GT Bump is a good one if you get one, cheaper version was the GT tour [most expensive BMX you can buy in halfords]
Here's a couple that you think would be pretty good but are wank, my lad has destroyed them both, the vertigo is dead at 6 months old and thats after i put a new wheel and chainring on it and a new headset
2008-11 GT vertigo [heavy as lead]
2008-11 GT Interceptor [as above]
and all of these are to be avoided like aids
Vibe
X-Rated
Snob
Magna
Apollo
Trax
Rooster