Help with MP5 choise

Hi, i'm from Brazil, and here, airsoft is expensive as hell, so for my first AEG (mainly CQB at start), i will choose one of the two below:

Oh, and don't be scared about the price, if i accounted the minimum wage of US$288, things would be scarier.

ICS GSG 522 MP5 - US$479,00

ICS GSG 522 MP5 RIS PK (Full Metal) (With Swiss Arms Red Dot) - US$431,00

*Velocity: 445FPS (135 m/s) w/ 0.12g - 345 FPS (105m/s) w/ .20g;

*Energy: 1.1 joules;

*Precise Range: 30 metros;

*Max Range: 55 metros;

*Hi cap mag: 250 BB's;

*Weight: 2.4 Kg (Full Metal);

*Weight: 1.8 Kg (Normal);

*Lenght: 38,6cm (Full Metal);

*Lenght: 54cm (Normal with folded stock);

*Lenght: 69cm (Normal with extended stock);

*Batery NIMH 9.6v - 1.200Mah;

The basic difference between the two is that the second model is a MP5 pistol, full metal and no stock and the first one is a normal gun, with folding stock, but only the gearbox is made of metal, both of them made by ICS, under Cybergun.

Oh, and since i'm already at it, what start upgrades should i make, like batteries and such?

P.S: Sorry for my bad english...