DSLR's to get for entry level?

I'm between 3, (in reality 2 but I'm open)
-Nikon D5100
-Sony A55
-Canon Rebel t2i
What do you think it best? What are your reasons though? What brand do you prefer? I'm leaning towards that Rebel but the a55 does have better specs… Then again the big names are Canon and Nikon. Also since they all come with 18-55mm, I'm going to Europe (Places like Paris, London, Madrid, Italy etc) Should I get a bigger lens? I want to spend $800 max. No more really, I don't see the point since I'm starting. I like Canon cause they are more open to lenses being switchable, but I never owned a DSLR but I know how to use them well. Also what other cameras do you guys like?

Either the Nikon or Canon. And read this: http://improvephotography.com/227/differences-canon-vs-nikon-dslr-cameras/ for a bit of an informed choice.

Try this: Go to a store, pick up a camera, and adjust the aperture, the shutter speed, and the ISO. You'll use these three a lot. On which camera are these easy to do on?

Also, flick the ON/OFF switch, and the Image Delete button. On which camera are these knobs and buttons feel easier to use?

An 18-105mm or an 18-200mm (if you can afford it) would be nice.

Like? Oh, you're gonna hear from loyal Nikon and Canon fans here for sure.

Don't get the Sony, it has a weird mirror. Simple as that.
Better to invest in lenses than to invest in the body, also simple.
I recommend you ignore my answer and go with the first person's answer, but for my dime…
I find aperture and shutter adjustments very easy on the D3100. However, I have to choose between knob+modifier button adjustments for white balance or ISO. Can't do both. The flash mode is a button tap and the flash exposure compensation requires a modifier button and the knob.
Exposure compensation requires the +/- modifier button and the knob.
Knob. Rotary switch. Whatever the thing you spin on the back is called.
If you're going to Europe, invest the extra money and get the image stabilization lens with something like 50-200mm, for distant scenery. Make sure it has the image stabilization. If you skimp on this, you kind of defeated the point of getting a DSLR to begin with, especially with stationery subjects. The kit lens does have image stabilization.
I strongly recommend the D5100 because it has exposure bracketting(you'll love doing HDR of the scenery or at least having image sources to do it later) AND the D5100 has a flip and swivel LCD.
Since newer DSLR's come with live view, this allows photos from very interesting angles, and helps a lot with video!
You're on your own for the Canons. All I know is that most of the reviews I've read and comments I've heard give the Nikon the edge in the _current_ generation of _entry level_ DSLRs.