We wish to capture an AC (sine) signal, 5V peak to peak, frequency is 1kHz, and duration of signal is 10mSec.
So can you suggest us a board or IC (preferably pin compatible with Atmega2560 or Atmega 328) whose ADC sampling rate is 200,000samples per second?
Thanks in anticipation,
For analog samples Arduino gets standard up to 9-10K samples per second - with some tweaking some more -
Think you should go for a faster clockspeed CPU like the NXP MBED - Homepage - Handbook | Mbed - (its on my wishlist 
Check the spcs - http://ics.nxp.com/products/lpc1000/datasheet/lpc1763.lpc1764.lpc1765.lpc1766.lpc1767.lpc1768.lpc1769.pdf - Page 62.
Why do you need to sample a 1kHz signal at 200kHz?
Pete