Anything over 500 will destroy your an AEG after a few games-worth use, I don't care what your internals are made of.

Only $200 for their "best" gun? Doesn't sound very good to me, a decent high quality starting gun here costs around $380 - $400 and a fully upgraded internals AEG will take you to the $800 - $1000 range depending on the gun and if you use "brand-name" components.