In the $200 to $400 category you're not going to find anything that will suffice. Figgure on spending at least $1,000 and that for used equipment in good condition. If you are fortunate, a used Yamaha PSR-3000 will be adequate and provide the sounds you are looking for.
Good Luck,
Gary
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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)