So Im saving up for when Im 19. The second I turn 19 Im getting a airsoft gun and going to start to play. Since Im 15 I got 3 years to save up for some guns

. So here what I think I would like to save for I'll post links to the items as well, and feedback on my choices for when I start in a few years would be great! Also, I've heard that buy airsoft.ca isn't that great. But I think to start with it would work.
ICS MP5 A4- I like MP5's so I found this one and thought I would start with it. Dones come with a battery/charger so I would have to get one.
Intellect 8.4V Battery (For MP5)- The battery for my MP5
The charger for my battery -The charger
200 round MP5 mags - So I thought about getting 3-4 of these for the MP5 so I'd have to reload less, next is the mag clamp.
MP5 Dual Mag Clamp- So I thought I would get one or two depending on how many mags I get, to make changing mags quicker.
Metal Rail Mount for MP5's Just so I can add a scope if I want.
Tactical Scope - So I can put a scope on every now and then.
Tactical Vest - Self explaining
TOTAL: $883.00
When I added it all up I wasnt surprised about the total cost, as when you start it would seem to be the most expensive, so anything bad/problems with what I would like to get in a few years?