Super Robot Wars: Alpha Gaiden, imo. PSX, so not as flashy as the PS2 games but better than the GBA games. If you happen to like Gundam X or Turn A, it's definitely the best place to start, since it incorporates their plot.
Also has orgasmic emulated music. >_>
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KrahenProphet and Kana are on opposite ends of the Awesome Spectrum.