If you are interested in comparison between Garmin 305 and Garmin 205 you may want to read additional info on this site:

http://garmin-305-review.com
http://garmin-305-review.com/garmin-205-vs-305/

It may help you decide whish one is better for you.

I would go for Garmin 305 as the best price/quality choice.

Buy Garmin 305Forerunner at best the price at Amazon:
http://www.amazon.com/Garmin-Forerunner-Receiver-Heart-Monitor/dp/B000CSWCQA/ref=as_li_tf_ssw?&linkCode=wss&tag=mirjamitropho-20

Buy Garmin 205 Forerunner at the best price at Amazon:
http://www.amazon.com/gp/product/B000CSQJ8C/ref=as_li_tf_tl?ie=UTF8&tag=mirjamitropho-20&linkCode=as2&camp=217145&creative=399373&creativeASIN=B000CSQJ8C