For instance, I'm a fan of the IWC Portofino Chronograph IW391007 (http://www.iwc.com/en/collection/portofino/IW3910/) but i think the case might be too large.
go for a good used piece, you will get a better timepiece for less
- iwc portu. as mentioned
- rolex air king, 36mm, inexpensive for the brand , they come in many colors, and have a metal band (good when you are getting wet) and you can swap on a leather strap when you want to have leather