A good investment would be a model of the WOC-X serie from G&P.
Some of the models outside this series are not so expensive either.
http://shop.ehobbyasia.com/other-gun...html?limit=all
Before you start searching elsewhere they're only on Ehobby.
They are reinforced and feature a NPAS. That's a good choice for a first GBBR.
Depending on the budget and model/custom you want you may also ask a gun doc to build one.
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Tous les jours nous nous endormons plus instruits mais pas forcément moins bêtes...
I can do a CTRL+ATL+DEL on your gun !
Gun doc in Montreal on AEG, GBB, GBBR and Bolt rifle (gaz and spring)
Heavy custom builder (including painting)