Buy stripped lowers. They're cheap, and you can build them up into whatever you want at a later date if the laws are more friendly.
Even if the laws get worse, you can build them into pre-postbans, or post-prebans or post-postbans??? Hell, now I'm confused...
So $1000 could get you 10 AR lowers.
If the ban goes away, we all win.
If the ban stays as is, then you break even, and can sell the lowers if you wish.
If the ban is replaced with a more oppressive bad, it's a win-lose situation. You can't get new guns, but you have 10 ARs that are probably worth a lot more now. (yeah, yeah, put an upper on one, and swap it onto all the lowers once, so you can claim that it existed in that configuration prior to the ban)
HOWEVER, if the new ban is horribly oppressive and bans all existing 'assault weapons', well then we're all fucked...