If that's what you really want then buy it.
Mags for that gun are $45 bucks a piece, so factor in another couple hundred bucks for that. With 5 mags, you'll have 200 shots, which an AEG can carry in one magazine.
It's November, don't count on using that GBBR outside because gas isn't super reliable in cold weather.
It shoots 380 FPS, which will be too high for some indoor fields, better get an NPAS too and install that as well if playing inside is in your plans.