Looking to get an electric airsoft gun...

First of all, let me make it clear that I'm not looking to getting into airsoft. I used to play paintball, and I just don't have the time or money to go out to fields and buy expensive parts to make marginal differences.

The biggest difference I can find in my limited research are the gearboxes. Plastic vs Metal. I don't mind having plastic bodies because I'm not going to run around the woods with these. I just want to shoot some cans, targets, and terrorize my girlfriend. But having a plastic gearbox kind of makes me uneasy. Do the plastic gearboxes wear out fast? Do you think that I'll regret buying a gun with plastic gears? Should I just save up a little more and buy one with metal gears?

Here are a few that I've been eyeing. Keep in mind, I'm only going to be shooting cans and my girlfriend's ass, and hanging it in my TV room to look cool.


http://www.airsplat.com/Items/ER-DE-M82-SG552.htm




http://www.airsplat.com/Items/EL-BI-M4-3181.htm


And if I were to step it up a little, I'd get this one:


http://www.airsplat.com/Items/ERM-JG-M5A5-069.htm

 

I used to own the one second from the top (the M4 with M203 look-alike) and mine broke after about 10 shots..and pretty much everything that it came with was completely useless.

This will work just fine
http://www.airsoftgi.com/product_info.php?cPath=139_24_200&products_id=7531

Seriously though, metal gear box FTW.