i know about the D3100...i wont mind about video...so...is the picture quality a big different?

Yes. Better and most shop don't carry D3000 anymore as D3100 price is the old price of D3000.

Yes. Better and most shop don't carry D3000 anymore as D3100 price is the old price of D3000.

i'm using d90. when i open my popapflash the shutter can only go until 200. but my friend can go untill 4000. izzit setting or my d90 have a problem?

hmm..okay..thanks to all of you..guess i gonna topup my budget now...1900...

D3100's ISO performance is better than D3000, sensitivity up to 3200 and uses CMOS sensor while D3000 supports up to 1600 and uses CCD sensor 

I think CCD sensors are usable up to 800 only =p, I see my fren's Sony A230, huh..... iso 800 is unusable, 

I think CCD sensors are usable up to 800 only =p, I see my fren's Sony A230, huh..... iso 800 is unusable, 

pop up flash can only support sync speed up until 1/200..
if u're using external flash then 1/4000 will be okay if the flash is powerful enough..

u guy know that light travels very fast right?
but after 1/250 the light wont be sufficient to reach the subject, esp when ur subject is far (when using pop up flash)
by getting an external flash, u can get power.. the flash will add more power to the flash/light that will make sure the light reaches the subject to catch up with the 1/4000 shutter..

but not all external flash can do it...
in nikon, its know as FP, its automatically enabled in sb600, sb700 and sb900.. other model ie sb30, sb400 i havent check yet..

thatis the logical part of the answer..
for the more 'technologycal' part u have to wait for someone else expert to explain..

I use photoscape, my watermark simple je .