dude BUDGET ??!!! thats like the most important thing.
If im not mistaken the optra rear door speakers can only accomodate 6 inchers and the pioneer 6990 are 6 X 9 inch oval speakers so will not fit.if you wish you can cut the rear parcel tray and add the pioneers out there.im not sure which speakers come stock in the optra but if you want you could add components in the front to enhance your ICE setup.
the 5750 would be a better option than the 4750 so id say stick with that.see if you can get a discount if you tell them you dont want the speakers and head unit.if they dont give you one id say just change the head unit and listen to the speakers for a while.if you find them good keep 'em other wise go ahead and get them changed.if you just listen to music i think those speakers should do fine but if your a hardcore music fan and need chest thumping bass youll need better speakers...hope that helped
rev
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