I recently bought a Nikon D90 camera body, which has a "DX" APS-C-sized sensor..
Within the same budget, should I go with DX lenses or should I get full frame lenses in case I upgrade to a full frame body in the future, when they become more prevalent?
Answer
The price you pay for using FX lenses on DX is bigger and heavier lenses and less appropriate focal lengths.
The core question you should be asking is: Why do you want to upgrade to full frame? Image quality in DX is superb and getting better. FX bodies have better low-light ability, but DX will be just as good; it just lags a few years. The higher resolution is a factor only if you have both great lenses and great tripod support - i.e., very few people. FX bodies will always be larger and heavier, and DX will be with us as long as F-mount is. Unless you can articulate a specific, good reason for an eventual FX upgrade path, stick with DX.
Finally, keep in mind that lenses retain their value very well. If you can sell a lens for 70-80% of what it cost you, why not just buy the most appropriate lenses and sell them if they become inappropriate?
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