Wait for D800 and you shall have the latest FF for 3 years or longer. Buy D700 and it get "obsolete" in a few months. Quoted because some are not happy with an old model although it still produces great images.
Actually, that's quite hard to say as well. I had a similar point of view, but looking back here's how things looked:
1. In theory, the D700 should have made the D3 obsolete. It did, to a point, but the D3 is still an awesome camera to date.
2. The D3s which replaced the D3 is over twice as expensive as the D700, and the D3 was discontinued. What does this mean for buyers? Not many people will sell the D3 for that much more than a used/new D700, depending on condition. People who, based on their needs, would have bought a D3 bought a D700 instead, while action and street photographers who shot for a living and wanted the extra 1/3 stop performance, went for a D3s instead. The D3x is far more expensive but fills a different niche, so it's not even a fair comparison. Bottom line is, I wouldn't expect the D800 to be priced at the same level as the D700. I'd expect it to be priced between the D700 and the D3s, but my speculation is based on historical data. When the D7000 was released, many people expected the price of the D90 or the D300s to drop, but they didn't, at least not by much at all. Of course, one could also argue that when the D3100 was launched, demand for the D3000 plunged as the price difference wasn't much, though D5000 prices remained fairly stable since it was the only model with an articulated display.
3. As someone rightly pointed out, the D700 is more camera than most people need. My reasons for getting the D700 was for the improved low-light performance, which I have found useful for sports and concert photography, but also because I didn't see the point in getting a D300s/D7000 and then upgrading again later to an FF. It just didn't make sense to upgrade several times along the way when I could just bite the bullet once and get a decent FF. But that's just me, and others may beg to differ from that point of view. Having a built-in Commander model for remote flash triggering with CLS hasn't been a bad thing either.
Did I regret getting the D700 back in December? No. It is an amazing camera that has delivered on many occasions, and the amount of control I have within easy reach has opened up new discoveries and lessons for me. Would I buy a D800? That depends on the pricing - if it was priced no more than 20% over the D700, offered 18MP with the same low-light performance as the D3s, I would probably seriously consider getting one.
Question for the OP is, with the D3s at SGD6k+ and the D700 at SGD3k, would you buy a D800 at SGD4k? Remember that this is just for the body only, and you won't have the benefit of more affordable DX format lenses.

A couple of professional photogs I know in Dubai run a dual-body setup - one DX (usually D300/D300s) and one FX (D700/D3/D3s/D3x), and reason I brought this up is because if the price of the D800 comes up to SGD4k+, it might actually make more sense to buy a used D700 (approx SGD2.8k for a practically new one) and a used D300 (around SGD1.3k) for a really killer combo.