Depends what you want to mainly use it for , a lot of the cheaper ones ain't worth a toss. I bought a Foxwell one off Amazon, and have yet to find any car it will work on.

As I run a Golf I bought OBDeleven which is only for vag group cars, bluetooth dongle for Android phone and it's brilliant.

Saw an online review on You Tube of the Launch that was about £200 and it seems decent. Will see if I can find the link (bit more than your budget tho) http://www.cartool.co.uk/wholesale/l...hoCj54QAvD_BwE