Netgear wndr3700-100nas

So I have been thinking about putting custom firmware on my router for quite some time, but never really had the motivation to finally pull the trigger. I want to get some custom firmware on there just because the netgear one is so finicky, and i want to be able to set up a VPN on it so i can access my NAS remotely.

Anyone have any opinions on good custom firmware that i might be able to use? Or some tips on how to go about it?

I use openwrt, i haven't messed around with most of what it can do but it seems pretty powerful. I'd give that a go if your router supports it