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What's the word? Which SE spiders support http 1.1 and which don't?
The one caveat I would mention, is that if for some reason you get banned, then being on shared IP's can really do a number on your domains. This seems to apply more to individuals and smaller ISP's (probably because they look like an individual with a few hundred domains) then it does to large ISP's. It could also be that the larger ISP's have agreements with the SE's.
For example, Hypermart domains are banned at AV, but if you have your own registered domain hosted at Hypermart then AV indexes it just fine even though it is on a shared IP.
All sites at Hypermart share IP's, the key is to have a registered domain hosted there to get around the AV ban.
The thing to be careful about is that when you register the domain, hypermart adds the entry in their DNS but also leaves the old *.hypermart.net address active, so both the old address and the newly registered domain lead to the same place. If you have pages indexed you will want to be careful not to submit those pages already indexed with the new domain name. Just change the links on the *.hypermart.net pages to point to the new domain, over time the new domain will completely take over in the listings (remove all traces to the *.hypermart.net domain on your links).
It's not for me to say, but if it is important enough for your client to get listed that they will register a domain name, I would also pay the $25/quarter hosting fee to get the banner off the page and remove all traces of hypermart from the page IMO.