MS HomeServer hasn't taken off anywhere; Drobo is a kludgy two-device approach (direct-attached drive+server attachment) that makes little sense unless you already had or want a Drobo.

Iomega StorCenter is good. Better choices: Netgear's ReadyNAS line (Duo or NV+). Or, a lesser known brand, Synology, or Buffalo. I think all of these allow some level of remote access...