Worth paying $70 more for a B-stock GTX 980 over a brand new GTX 970 from Newegg with a free game (that I'm not really interested in)?
I would, because of
1) VRAM funny business with the GTX 970s's 3.5+0.5 GB issues (can be an issue if you're using high levels of DSR or have a 3840x1440/4k monitor). I'm running Fallout 4 on a 2560x1600 monitor w/everything turned up except God Rays on Low and am using Reshade + TAA, and my VRAM usage, as per MSI Afterburner, is consistently from the high 2GB to mid 3GB range; usually around 3.2GB, but with some spikes to 3.5GB.
2) You can OC a stock GTX 980 to near stock GTX 980Ti levels in most cases (most overclocks usually hit about 5-10% short on average). I have a near-stock MSI GTX 980 that is by no means a good overclocker (rather plain non-stock blower cooler) but it still hits mid 1400s w/GPU boost on air.