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I have an 84 Aspencade and love it. I purchased it about 4 months ago and when I did, it only had 14,101 miles on it. The previous owner had it for about 1 1/2 years and only rode it 1,000 miles. It has taken a while but it is running like a dream now. I still have a few quirks to work out but it is getting better.
One thing to remember about the LTD and or the SEI is that they are more expensive than the Interstate or the Aspencade. OneBay the Aspys usually go in the 3,000 to mid 4,000 dollar range. The SEI's most generally get in the mid 5,000 to almost 6,000 dollar range. I have seen a few go over 6,000. I opted for theAspy as it was in my price range, had low mileage, and I could build it up the way I wanted it with the money that I saved over the LTD or SEI models.
As Paul said, with the fuel injection, they would probably run a little better but on the other hand, they are more costly to repair. eBay is loaded with parts for the 1200's. Only thing, the majority are for the I's or the A's and not the LTD's or SEI's. Another reason I opted for the Aspy is because of the fuel system. With the carb set up, I can work on it if it fails. If that computer controlled fuel injection failsI would havehad to take it to a shop for repair.
Here is a link to an SEI that is on ebay right now and still at an attractive price.