Some of the least expensive entry-level DSLR cameras?

So, I'm looking into going into photography, but I want to go a bit further than just using my Digital Compact, and it's my birthday in 2 months, it may sound ages away, but I want to know which camera I'm going to ask for, I reckon my price range is probably up to about £350-£450… I know that limits me but I was thinking of maybe the Nikon D3100 or Canon EOS 1100D?

I was exactly the same, the main thing is, at least you know you're definitely going for a DSLR, I had no idea what type I was going to get.
I got the Canon in the end, but this was mainly due to a great package by Jessops. If you go and look in there, they tell you more about the cameras and let you try them out. They also help in finding the one that suits you. You can also look to see if any deals are on.
Also I've heard that Canons are better for beginners, but see which one you are drawn to. I ended up getting the Canon 500D, I spent a little more money to get the better one, even though they advised me to get the 1100. I didn't want to have to keep updating the 'body' of my camera, I don't have enough money really. That's the good thing with DSLRs though, you can keep all the lenses you get and update the body.
Mine also came with a training DVD which was really helpful. I think it was 'Experience Seminars' or something. But I just experiment withmy camera and look online for techniques as the DVD didn't explain the creative modes.
Hope this helped.

There are canon, nikon, pentax, sony cameras…

look at not only the cost of the bodies, but the accessories too…

and whether you get a single or twin kit lens…

if you are on a budge, look at bridge cameras…

Both are fine cameras, and capture the photos you need, as long as you know what you're doing. I don't think you'll see any difference in image quality so whichever one you choose doesn't matter.

Go to the store and have a feel for both cameras. The real difference you will immediately see is the placement of the buttons. On both cameras, adjust the aperture, shutter speed, ISO, and also the Image Delete button.

Which one is easier to manipulate for you? Which one is more comfortable in your hands?

The least expensive system to buy into is Pentax, they have all the functions you will ever need, even at entry level, image stabilisation built into the camera so any lens you fit, even any of the older lenses available will be image stabilised. Some of these older lenses are cheap to buy and have great image quality. They will all meter correctly and work as designed. Over 200 to choose from and that's just those made by Pentax add in 3rd party lenses and that figure nearly doubles.

There's one caveat with Pentax, if you want creative video, don't buy Pentax, then a mirrorless camera has the edge, notably the Panasonic GH2, but the cheaper G series work well too.

You'll find there's very little to choose from between the current crop of DSLRs, in terms of image quality. They're all excellent. So choose mostly on what feels right in your budget. Actually try some hands on.
Also don't discount some of the newer breeds of camera. Micro 4/3 cameras are quite exciting, advanced compacts have much to offer and both Fuji and Canon are introducing some cameras right now that I think are pointing to where cameras will go, more compact, all in one, big(ish) sensor with a great lens. Look at Fuji's x100, x10 or x-pro 1 and Canon's g1x, these might be out of your budget now… But prices do tumble.
Have fun with your new camera

Canon Rebel t3i