1, It depends very much what you want, unfurnished, furnished or semi furnished. Furnished 3 bed could cost up to 12000 dependant upon the compound, you can get 2 bed apartment for 9500 (good facilities).

2, Housing at present is plentiful - there has been a lot released onto the market in the last 12 months.

3 CRV are a little on the expensive side - rental for what you get they can be around 3k per month, but be prepared to look around and wait

4, You can drive on an Omani licence for 2 weeks and it is easy to convert.