You may have heard this already, but remember that buying your first DSLR is sort of like buying a subscription to spend more money on stuff for your DSLR -- not that we don't all love it. ;-)
With this in mind, you'll want to give a little thought to the whole "system" you're shopping for -- not just the camera body. Over the years, you'll very likely wind up upgrading your camera body, and probably even some of the lenses you buy initially, but hopefully you'll stay in the same brand / system so these investments are incremental. You're quite likely to wind up shopping for bags, tripods, flashes, and other accessories over the next few years, too, though at least some of these accessories are brand-agnostic.
Also high on my list of recommendation for prospective DSLR buyers: get to a store and hold a few cameras. Play with the controls. See if one brand feels more natural to you than another. This is something you really can't get a sense for by reading online reviews, and this preference can be different for different people.
For what it's worth, when I bought my first DSRL, I opted for a used Canon 30D vs. a new Rebel -- in part because it felt quite a bit more solid and I loved the fact that the 30D had controls for all the stuff I'd need to change while shooting, vs. needing to navigate into a menu to make the same changes. You'd be surprised how important ergonomics are when you're shooting.