You can check the advertisement forum of WHT and find out for some of the offers placed by the various hosts. Also you can place a request quote and you will get appropriate response from the various hosts as per your requirements:-
One thing I'd like to say is that if your access database is a large one that is accessed frequently by your site, you'd have trouble staying with any host as MS Access can be unreliable and can really cause excessive CPU usage
MSSQL is the way to go for anything large. My understanding is that you want to host a really big ms access database.
You may want to check out reseller-center.com. I have used them, in the past, w/ excellent results.
Good luck w/ your search!
Allen Burnett StormHosts[email protected] Professional MS ASP, .Net, MS SQL 2000/2005 and Reseller Hosting Since 2001 Clustered servers @ Equinix Helm/cPanel/WHM/VPS/colo/Dedicated/MailFoundry anti-spam/Server Mgmt