Is there a high 3D Animation/Modelling software which I can buy for less than £500/$878. To make 3d games like they have in top games today, or a software that comes close to it. Thanks for your help

3D Software $100 to $1,000
3D Matrix
Amapi Designer
Amorphium Pro
Carrera
Cinema4D
GameSpace
Hash Animation Master
LightWave 3D
Modo
Pixels 3D
Plasma
Poser
Realsoft 3D
Shade
Silo
SketchUp
Softimage|XSI Foundation
Strata 3D
TrueSpace
ZBRUSH

Unfortunately not all of those will give you what you need, but the list is good.
XSI, Lightwave, or Cinema4D will be almost neccessary (I recommend them in the order I listed). For making the high-poly model, you should get ZBrush. Silo and Modo are good, cheap modellers, but I'm not sure about their animating/binding capabilities.

Edit: I'd stay away from the programs on that list I didn't mention, with the possible exception of Amapi. I either haven't heard of a handful, or the others aren't really what you're looking for (ie, not good at finished graphics, or creating things from scratch, etc).