Man, oh man. You really have been bitten by the resto bug, haven't you? Just a little suggestion. This isn't the best solution money wise, but it is a good solution storage wise. You could take all the usuable parts off the car, or anything someone would want. Then, sell the car to the local wrecker for $50 or something. That way you have the parts you need, without the extra car.
I know if I were to buy a parts car [probably never going to happen], I wouldn't even bother looking at anything other than a White SSE. I don't know about the parts compatabilty between later years, but if its anything like the 87-91'*, the car would almost be worthless in terms of parts. Especially interior parts. I wouldn't grab the SE, but that SSEi sounds like it would be of more use if you asked me.
'89 SSE - GX3 -190k, 155k on body - Back for another ride.