If you can handle the hassles and tenant issues of rental properties, then have fun. I used to have some and decided that IRA's and other accounts are much less trouble. A rental property is not free money, it is a part-time job. The rate at which your PT job is paid depends on the rental and the amount of time you have to put in. I don;t like that most staes the tenants have more rights than landlord and you have no real recourse. Good tenants worth it, bad tenants spoil it for everyone else.
I would max out your pre-tax, to build up some IRA type savings and save the highest tax rate on that money; your tax rate in retirement is most likely less than current. Any left over put into real estate if you want.
The advice we're giving you is invaluable, that's why it's free
Experience is a good teacher, but the tuition can get expensive real fast
Semi-Retired 7/1/16: working part-time ( 60%) for now [4/24/17 changed to 80%]
Retired Aug 2, 2017; age 53