Buy gas pistol that uses green gas - you will be around 120-130mps in summer time (though it wont work in winter or you will get very low mps)
If you still want AEG pistol, get either KJW or Marui, or a chinese-made CYMA Glock 18C AEP - absolutely the same as Marui Glock 18C, but costs like 3x less.