£500 to spend on a new turbo
 

As the title says I've got £500 to spend on a second hand turbo for my wrx bug
The car is on 95k and been serviced regularly
Spec is as follows
Full decat 3" system including up pipe
FMIC
Pink injectors
340ltr fuel pump
Enlarged inlet pipe
Large KnN cone
Ngk fpr7b plugs
Once I have a turbo to go on it will be getting remapped with ecuTek

What turbo to get best mid range and over 320bhp or as close to 350
And is anyone selling one?

Vf23,Vf30, vf35, vf43 gt30 all available for under that money but which I want to order today

Jap car spares in crawley have an apexi turbo for £575
Supposedly a straight replacement good for 380 bhp.
Otherwise go for a vf34/35 even a vf28 will see 320 just