Sounds a lot like some of the first posts I made on this board
As the kids on the internet say, "learn from my fail".
Your passion, motivation and interest is spot on. You're going to love Rover Ownership. Just don't pull the trigger on the wrong one. I had the exact same goals and challenges - balancing budget, excitement, availability of trucks, etc. Ultimately, against the good advice of many on this board, I chose to import a truck sight unseen. Truthfully, I wouldn't change a thing about the experience, I love my truck. But if I had known then what I know now, I would likely have keept looking here.
Which leads to part of the challenge - evaluating the right truck. I'm not sure, even if I had found a truck in the US, I would have made a smart purchase. Simply because, unless you have history and experience with Series Rovers, it's hard to know how to really evaluate them. That's easily confounded by aesthetic - a nice paint job on a rusty truck fools our brains into like it more than faded heap in great mechanical shape.
What's your comfort level with mechanical systems? Could you look at brake lines, wheel cylinders, drums, etc and make a fair evaluation of their condition - or for any other major system? For me, looking for a learning project, it would have helped to find someone to take with me who had that expertise (several here offered).
Finally, to the point others have made, where do you want to put your time and money? For instance, for me a paint job seemed like a $3-4K endeavor on a beat up truck. But, if I totaled up all the parts I've put into fixing system problems on my shiny truck, it's probably more than a paint job. I'm using paint as an example here, but it could just as easily be the frame, motor, etc.
Today, I might rather drive around a mechanically sound work in progress, and slowly add money to the fun things as opposed to making a poor buying decision and having to pour money into keeping it going.
As for the wife thing, if you think she'll love it, then she probably will. Mine loves our series, although I can't ever get her interested in driving it. To her, it's our weekend ride with room for the dog, it takes us camping... what's not to love? When it comes to budgeting for it, we treat it like anything else. I subtract about 50% from costs when I tell her about them and she subtracts about 50% of costs when she tells me about the shoes she buys and we both live blissfully ignorant.