Try to find a used one at velomarkt.ch,http://www.velomarkt.ch/veloboerse.php (occasion), otherwise you can spent
a lot of money(some guys spent up to 15000 sfr for a bike), additional cost are the (funny) clothing, shoes, energy bars .....
The track around the lake (zurichsee or greifensee) is well worth a try , but at the zurichsee is more traffic(big lorrys) and the track is between 70 and 90 km(when you cross at Rapperswil it is only 70 km).
And you have to do little service(tyres, brakes) on your own, because at the shops you got a waiting time for up to 2 weeks for repairs or service(buy yourself
a floorpump and a collection of small tools).