What is it that you really want?
Ok, you got a Rem 700 that shoots ok, but could be better (and the first thing I would do is try different ammo/bullets/powder, before doing anything to the rifle), and a guy with a fancy, non standard model 94 who wants your rifle and cash to trade.
First off, who's pushing the trade, you, or him?
Next, what is it you really want? A pretty lever gun that odds are will not shoot any better, or even as good as your Rem 700? A .30-30, most likely (although you didn't say)
SO, you get a nicer looking rifle, in a caliber that doesn't do what the .243 does, can't be easily scoped, and will have a tough time matching the mediocre accuracy you are currently getting from your .243.
What the gun is worth in cash only matters if you plan to sell, trade it. If you are going to use it, then it is accuracy, performance, and handling that matters. A Win 94 with a 26" barrel isn't going to balance the same as the regular 94 carbine. No way. Not as "handy" in the woods. .30-30 is not as well suited to longer ranges as the .243. The Win 94 doesn't scope well, and the stock is all wrong for that was well.
If you are looking for a deer rifle, your Remington has advantges. But are they enough to matter in the kind of hunting you do?
All Winchesters are insanely overvalued these days, compared to their real world utility. But then, I remember when you could find used 94s in every shop for $200 and under.
If you want something to collect, and maybe use the Win sounds nice, it is definately not standard. IF its what you want, go for it. If its what he wants, I'd pass.