Steve, not exactly apples and apples, but .....
I used to own, and like, Spica Angelus. Like the TC60s the imaging was very good. I borrowed some spendor S3/5s from a friend, expecting that they would beat the spicas (since they get such rave reviews) and I was extremely disappointed. The S3/5s were extremely vague in imaging compared to the spicas, and were no better in terms of frequency balance.
I would be very wary of moving to spendors if imaging is important to you. Anyone who says that S3/5s can image has never heard a speaker that throws a true stereo image.
I ended up with Green Mountain Audio Europas, which, in my opinion, slightly exceed the imaging of the Spicas, greatly improve on the bass and dynamics of the spicas, but are a little brighter in overall tonal balance.