Unclechoppy,
I'd suggest you ask this same question over on the audiokarma forums where there is a much broader, and experienced knowledgebase regarding vintage equipment. The regular contributors there would also be able to assist with required maintenance for speakers on your wish list. Something like the Harbeth SHL-5 would be easier to own, since its still in production, than something like the Allison where replacement parts could be hard to find. Foam surrounds are easily replaced, but you would want to make sure proper sized surrounds are still available before committing.
From your list, the Harbeths and Spendors would present the lowest risk in that they're generally respected, and could be easily resold if they weren't to your liking. But, I'm not sure how well each of those would work in a near wall environment. I understand Harbeths need a bit of room to keep the bass under control.
Best of luck with your selection and let us know what you end up with.
I'd suggest you ask this same question over on the audiokarma forums where there is a much broader, and experienced knowledgebase regarding vintage equipment. The regular contributors there would also be able to assist with required maintenance for speakers on your wish list. Something like the Harbeth SHL-5 would be easier to own, since its still in production, than something like the Allison where replacement parts could be hard to find. Foam surrounds are easily replaced, but you would want to make sure proper sized surrounds are still available before committing.
From your list, the Harbeths and Spendors would present the lowest risk in that they're generally respected, and could be easily resold if they weren't to your liking. But, I'm not sure how well each of those would work in a near wall environment. I understand Harbeths need a bit of room to keep the bass under control.
Best of luck with your selection and let us know what you end up with.