Well you'll have the "returns version" of Supes. It's still a good figure but i'd keep it and then just buy Reeves supes anyway.
The thing is, the 2 in 1 looks nothing like Routh - I'm assuming they only paid to use the image rights a couple of times. The best Routh Superman is the spare head from the Clark Kent Superman plus a V.1 or 2 in 1 body.
This is going to annoy people but I actually prefer Superman III to Returns! I didn't think this could be possible but I caught III on UK TV the other day and I quite liked it - first time I've seen it in 25 years. Yes, there's no main plot, just lots of subplots. Yes, Prior is awful. But the whole Smallville thing and the Superman turning bad thing is done pretty well and Reeve ennobles the whole thing with his amazing performance - he must have known it was a step down from the first two but he still does a great job. I was expecting to see garbage and it was okay.
Next time I watch I and II I might watch III in between I and II and pretend they're a trilogy with III as the middle movie!