...really wondering if an upgrade to full frame is worth it for what I'll be doing or any suggestions for lenses ect.
Upgrade is an interesting term. We hear it all the time. For example, "I want to upgrade from my point-and-shoot or camera-phone to a 'real' camera." (And this isn't you, by the way.) The thing is, that kind of a switch isn't an upgrade. A DSLR (or similar) camera is an entirely different system.
Now someone else is buying FX lenses because when they upgrade to a full-frame camera, they'll be set with lenses. (And this one might fit for you.) In this case, the thing is that FX lenses aren't at all the same lenses. An FX lens on a full-frame body has an entirely different feel than on the DX body. As obvious as this is, some people find that they'll miss the feeling that they had previously and "need" to buy more lenses. So the point is: be ready for a full-frame camera to cost more than the cost of the body, even if you already have the lenses. For some, it's unavoidable.
So anyway, I shoot full-frames most of the time. And I'm Canon by the way, but for this discussion it doesn't really matter. I have a 17-40 which is a "wide angle". And I don't really like it all that much. Yeah, it's decently wide and okay on length, but nothing really special. For my wide-angle stuff, I like my 14mm a lot. I also have a 24mm tilt-shift lens, but that's a whole different animal.
Would you like the same things? Who knows. But for most people I run into, getting into the "low teens" for focal length seems to be an enjoyable place for wide angle scenic work. But some people do great stuff with a much more narrow angle of view with scenic work.
I know a few Nikon people that like the Tamron 11-16mm lens for scenic/landscape work on a crop-sensor body, and that's less than $500. Probably a cheap way to get into wide angle stuff without spending much. But if you're heart's set on jumping into full-frame, that lens won't migrate.
On a crop-sensor, one of my favorite lenses for landscape work was 10-22mm.