Hi all smile

Been looking for a reasonable DP/synth for some time now. I found a used XV-88 for $600 (€450/500) in good shape. To get a reasonable piano sound I think I should buy an expansion card (either SRX-02 or SRX-11). I should be able to get one for some €150/€175 (some $200).
If I'd pay this $800, would I be having a good DP/synth with a nice piano sound? Or is this synth so outdated I'd be better off buying something else (S90 for example)?