I am interested in 3 guns. i need opinions!!

The first gun is a custom JG M4
http://www.airsoftmegastore.com/JG_Full_Metal_Gearbox_M4_S_System_AEG_p/jg-customss.htm
The second is an A&K M249 SAW PARA
http://www.airsoftmegastore.com/Airsoft_A_K_Full_Metal_M249_PARA_Machine_Gun_AEG_p/akm249-para-standardpkg.htm
And the third gun is a custom M16
http://www.airsoftmegastore.com/CUSTOM_A_K_Full_Metal_M16_SPR_Mod_0_AEG_Rifle_p/ak-d2-custom.htm

Please help me choose which gun the get. All 3 guns shoot over 400 FPS right out of the box. The only stock gun is the M249, and it is also the most expensive.
I am aiming to spend my money wisely, so i want the most bang for my buck.
I am not really in the "know how" of upgrading my guns, but youtube videos get the job done.
please tell me what the better buy is and help me decide.

I know it is the most expensive but I think the saw would be the best choice. It seems to be the only gun there worth the money because it would be the most upgradable. Unfortunately, I don't think that the A&K m249 would be shooting a stock 400fps. I would bet on 330-360fps.

really? well thats fine. i like the fact that it is more realistic and heavy cuz im a pretty big guy and can carry it, but i have exactly 280 dollars to spend =/.. so i might not be able to do upgrades fo a long time

Normally I would get the jg before I by an A&k so I guess I would also consider the jg m4.

And that also brings up another question.

If i choose on the SAW should i get the
MK1 http://www.airsoftmegastore.com/Airsoft_A_K_Full_Metal_M249_SAW_Machine_Gun_AEG_p/akm249-saw-standardpkg.htm

MK2 http://www.airsoftmegastore.com/Airsoft_A_K_Full_Metal_M249_MKII_Machine_Gun_AEG_p/akm249-mkii-standardpkg.htm

or PARA? http://www.airsoftmegastore.com/Airsoft_A_K_Full_Metal_M249_PARA_Machine_Gun_AEG_p/akm249-para-standardpkg.htm

I would get the Para version just so that you can fix the stock lenght to you liking.

i totally agree with dj and it is nice that they all come with a auto sound winding box mag.w

I have heard some great things about the SAW that you bought. I've also seen a video that shows how to upgrade it. They said its really easy to.

Ya i would go with the saw it is basicly all metal and it is nice wot shoot 400 fps but it still has alot of fire power. But thats just my pick.