Yes. I am totally agree with you bro. Therefore I said, FX is not always a solution and only solution for upgrade.
some people need DX some need FX. if one in need of reach and able to put aside subject isolation FX is not an option.
I am agree if money eventually brings value.
There is a reason why FX is more expensive than DX, in this case d700 is more expensive than d7000.
but again, one should justify where should their money go.
I believe it's not wise to upgrade to FX without considering those options.
Anyway I am a total noob, and I didn't own FX yet.
so I think it is better to return this question to one who has a lot of experience in photography. What do you think bro jchue73?
regarding D3100 vs D2X I can't say much.
I believe IQ wide D3100 wins but control wise D2X pawn D3100 any time. again I never play with D2X yet, so it might be my own opinion only.
-From here onwards are my personal opinions regarding camera. Please don't cucuk me
You know what.
Sometimes I felt that, camera will always be camera, what differentiate them are SLR/DSLR gives more control over compact camera or PnS.
when you are framing what matter most still the same, which is composition, perspective and control towards exposure. What differentiate pro and newbie are those three if I recall correctly.
Sometimes those who own PnS even tell more story in their composition and beats my sets hands down.that makes me feel guilty by having expensive camera (even mine, might not be expensive for your guys PoV).

+1.... XD
after c2age i feel my shots all under and not nice than other's , their seems expo nicely...well i havent check what model is that.