If you have a university degree plus high earnings over the last 12 months, there is also the Tier 1 (General) visa which you could try if you meet the points on the calculator that historyenne linked to. However, as mentioned, they are restricting the number of economic migrant visas that will be issued in the next few months, so it's not a great time to try to get one.
You need 75 points to qualify (plus 10 points for maintenance funds and 10 points for English language knowledge). If you don't have a degree, then you can only get the 75 points if you earned over £150,000 ($225,972) in the 12 months before applying, but if you do have a degree, you won't need as much in earnings.
The 75 points need to come from age, qualifications and previous earnings:
Age
Under 30 = 20 points
30-34 = 10 points
35-39 = 5 points
40+ = 0 points
Qualifications
Bachelors = 30 points
Masters = 35 points
PhD = 50 points
Previous Earnings
£25,000-£29,999 = 5 points
£30,000-£34,999 = 15 points
£35,000-£39,999 = 20 points
£40,000-£49,999 = 25 points
£50,000-£54,999 = 30 points
£55,000-£64,999 = 35 points
£65,000-£74,999 = 40 points
£75,000-£149,999 = 45 points
£150,000 or more = 75 points