Re: Update Manager Offers a "Partial Upgrade"? Read This.
I would use synaptic, making sure that the default setting is for "Smart Update" (or smart upgrade, can't remember). This is not as safe as apt-get but close.
You probably have a bunch more updates that are not coming to you because of the lack of the new kernal (31-13.43).
Dell 480 XPS 3G ram Quad Core 2.40GHz, Radeon HD 2400 PRO, Audigy1, 3x320G HDD, 320G External, Debian Testing for use, Debian Squeeze for secure use, Debian Sid for FUN