You basically want to consider several fixed and variable costs (many of which you can shop around for, some of which you cannot.)
Property Taxes - annual cost that varies by county and school district
Homeowners Insurance - varies by company and level of coverage - shop around. You can usually pay month or one annual payment.
Maintenance - nothing helps to minimize your long term costs and preserve property value than routine property maintenance. Annual A/C check-up, air Filters every 4 months, annual termite inspection, annual water heater service, etc - costs vary
Home warranty - I recommend them, other don't - shop around and compare coverage and prices.
One factor that you didn't mention was the age of this 1000-1500 sq foot home...the older, the more repairs are likely in the course of a year, but again, maintenance is key.