http://www.subaruforester.org/vbulletin/f115/overland-build-thread-567849/
If you aren't aware of this guy, now you are...
"Capable" is a broad term, but you're wise seeking feedback, as not everything is necessary to have a great time. Knowing what your adventure intentions are would help folks here guide you.
Having said that, start with things that can be used in all of your vehicles and based on safety. Recovery equip, first aid, navigational aids, air compressor, tools and repair materials, and a battery jumper (such as antigravity or noco). I have a brother-in-law who spent a few grand lifting their Outback with new wheels and tires, and didn't invest in a spare tire...don't do that.
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