Every modern Garmin smartwatch will give you ride-tracking information, basic analytics and will sync with apps such as Strava via the Garmin Connect app, so you don't need to spend a fortune to get involved. Obviously, the more you spend, the fancier features get and you'll also have access to full mapping and masses of health and fitness analytics.
Older or more basic Garmin watches tend to cost around $/£200 to $/£300, but the cheapest recommended watch here, the Garmin Instinct 2, is usually a little more than that. At the other end of the scale, expect to spend around $/£1,000 for the latest top of the range models.