Why not look at llano? They are starting to trickle into stores in the US, not sure about availability in the UK. Will beat the crap out of HD3000 on the intels. At least here in the US you can now get the dv6z which has the new fusion chip. Might want give Hp a ring and see if/when they will get them there.
Also note that the g62 has an "outdated" cpu, while the other two sport the new sandybridge 2310m, more ram and harddrive space. With the 2310m also comes the HD 3000 graphics. Performance review and games fps here at the bottom: http://www.notebookcheck.net/Intel-HD-Graphics-3000.37948.0.html
If you want to game at more than just everything on low I would really look at llano.