The BMP085 was actually the first sensor I bought. It is quite accurate with resolution down to 0.03 hPa. It is also very affordable. The chip itself is available for about $5 but since I have no way to solder surface-mount devices (SMT), I had to buy breakout boards that were slightly more expensive. Lastly, the BMP085 is easy to work with as it transmits data via I2C which is supported by the Raspberry Pi.
BMP085 Breakout Board from Adafruit
Another (cheaper) Breakout Board from SainSmart
The documentation for the board was fantastic, especially from Adafruit. Their tutorials were fantastic, and they actually have a whole library of code to get their sensors working on the Raspberry Pi. For this reason, you will see that Adafruit became a go-to source for parts and documentation.
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