First time upgrading

[llama_rock]

Just got myself a TM AK47 and am looking at upgrading it, its already got a prommy 6.03 tbb, 1J spring and new bushing's, but im looking at spending around £300 on upgrade parts.
I'm looking to upgrade the accuracy more than anything and have already got a few ideas such as:
.Firefly bucking
.Systema duracon piston head
.Guarder poly piston

I'm not completely sure if all those components would work together though, im also looking at getting a new motor (eg1000?),hop up unit and maybe a cylinder if it's worth getting one.

Could someone please steer me in the right direction and if possible recommend some upgrades,
cheers.
Kind regards, Nick