I have an FJ40 that I use for camping trips with my son. I'd love to tell you to buy one and fulfill your dreams, but you should also be aware of the tradeoffs you'll be making when buying one. It's not all smiles and adventures, there's a lot of hard work (or what feels like it) and suffering that goes along with the cool factor. They aren't very practical family camping vehicles, so forget about taking a third person along because 2 people is about the max you can fit and still have room for camping equipment. In stock form they're slow, underpowered, unsafe, and generally not much fun to drive on the highway for more than a couple hours a stretch. So if every camping trip starts out with hours of highway driving, that's something you'll have to suffer through every single time you want to go out. For <$10K you're not going to find one that's restored, so expect to do a lot of work, either you learn to do it yourself or pay someone to do it for you. Even though Land Cruisers have a reputation for being reliable, the newer ones are almost 40 years, old, they will require a lot of maintenance. And they are not cheap to maintain, most items will require ordering from a specialty vendor online instead of running to the nearest auto zone.
I wouldn't worry too much about prices going up either. Yes right now the prices seem to be at a peak, but you never know what the market will be like in a few years. If gas prices skyrocket again, the prices of these gas guzzlers start dropping like a rock unless you're looking at high end restorations. A practical person would tell you that in your price range, a newer Jeep Wrangler would be a much better choice. It would still give you the same feeling of adventure as an FJ40 (i.e. cramped space and somewhat uncomfortable ride), but you could get one that's 20 years newer, is more comfortable to drive for much longer distances, safer for kids, cheaper to maintain, and generally a more practical choice. But it won't be the car of your dreams, so you just have to decide whether you're willing to make all the tradeoffs just to have a cool ride (and yes I do think it's much cooler than a jeep, even though I own both).
So to answer your questions:
- I want a vehicle that won't cost an arm and a leg. -Don't buy a Land Cruiser. If the purchase price doesn't get you, the maintenance cost probably will. In my experience, the Land Cruiser name commands a premium to any jeep parts.
- Has to be reliable want to spend more time on the trail than in the garage. - Don't buy an older vehicle. They will almost always require more maintenance than a newer vehicle, if you're comparing apples to apples.
- Will I regret not buying the vehicle that I have always wanted. - Maybe. This is where you have to decide how much value you place on the first two priorities. Sometimes you just have to throw reasoning out the window and go with your gut feeling
Short answer, almost certainly not in good mechanical condition. 
