Try this link for the aluminum upgrades(the ones I recomend):
http://www.hobby-lobby.com/lamav4-upgrade.htm

I would get the first three on the page, along with heavy duty blades(not on that site)(it will probably be the last set of blades you'll buy)If they have them in stock!!! or EBAY is a great place to find these upgrades too. Or another option is my friend has a hobby shop and has all that you'll need to upgrade except for the inner aluminum shaft upgrade. that upgrade just keeps the flybar from popping out on a hard landing/crash. He would be happy to sell and ship them to you at a price you will not find online. If you are interested in purchasing these items let me know, then we can work out the details. He can accept paypal payments.

So the parts you can purchase from my friend's hobby shop(in the US) are: heavy duty blades(two sets, one upper set and one lower set), aluminum swash plate(this one makes a big difference in performance), and the aluminum rotor head, he doesnt have the inner shaft upgrade, but is not nessisary for better performance, it just looks cool!!!!

I run all the aluminum upgrades and the HD blades on my v4 and its one sweet flyin machine and I am also upgrading my esky king 2 with all aluminum, carbon fiber and brushless motor and esc.

The last link I gave you(v4lama.com) is for the extended shafts, this helps prevent blade strikes(they actually hit each other during a hard landing) I dont run them, but thought you might be interested, but they make you have to buy other upgrades to to make it all work togeather.

Have a nice day,
Dennis