95 to 98 Brighton or L wagon with the automatic would seem to be the best choice for you. The newer and lower mileage you can find the better.
Don't worry about the "interference" engines - if you do a timing belt kit with quality Japanese components the potential for a belt to fly off or break is essentially zero if the job is done right. Replace any plastic cam sprockets, and replace the harmonic balancer as well. They are much too old at this point and can't be trusted. Get these parts from the dealer. Use a timing kit from Aisin or piece it together with OEM or Japanese brand components ONLY. Replace the radiator (Denso or Koyo), and get new radiator and heater core hoses from the dealership ONLY. Use the wire clamps or use embossed clamps - cheap clamps will chew up the hoses. Use a dealer or TAMA thermostat ONLY. Replace the PCV valve and any cracked hoses and clean out the ports and nipples and fittings for the PCV system - get these parts from the dealer ONLY..... starting to see a trend here? Subaru parts in the aftermarket are almost always complete $hit. Anything you CAN get from Subaru, you absolutely SHOULD get from Subaru. They currently and for the last 5 years have a HARD ON for parts being marked NLA (No Longer Available) in their system. Anything more than 10 years old is in danger of parts shortages. Heed my warnings on this and what parts you NEED to get from Subaru and you can likely keep the car going another 10 years if you act soon. Won't be long before I'm telling people to avoid these chassis because they are time bombs with no support.
Change all the other fluids and check the brakes, etc.
It's not unusual for the power steering pumps to leak and you can get a rebuild kit from the dealer parts department.
For handling you can use WRX suspension on these cars as well. There are coil-over's that allow ride height adjustment - even slight amounts of lift - while offering much improved handling.
GD