Upload & Sell: On
I have considered the same decision, and at the moment am still using Canon's DPP software. DPP has added a lot of features that make it very useful to me, and I do not do not really have a need for adding keywords. DPP added a second ranking type feature, and that combined with the 1 through 5 category tagging works well for me.
I have used Lightroom some just to get a feel for it, but I am not sure I really want to learn in detail a new software unless I will be using the improved features it can provide. And for the occasional major image manipulation that I might want to do, I go directly to Photoshop.
Canon's addition of their Digital Lens Optimizer Module in DPP is another feature that may make staying with DPP a good idea. I have not worked with it much yet, but it has the promise of taking a lot of guess work out of optimizing an image.
If you do want to consider Lightroom, you should for sure make use of the 30 day trial, so that you know better if it is going to be worth the change.