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If you want to be entertained I'd suggest Dawn of Souls for the GBA. You get FFI and FFII in vastly modernized packages and you can probably find it for under ten bucks. If you want the full NES experience then go for it. Just be aware that the pacing is going to be much slower than you're used to if you've never played an NES RPG before.
So, does Dawn of Soulds add or radically change the gameplay of the first Final Fantasy?