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If you want to stick to Canon, the used market is full of pretty much new 5d Mark II's and 7d's at totally-a-steal price. And you get to use the Canon lens line up + superior third party support.
I just got a 5d II for 850€, it had 4000 shutter actuations (NOTHING!) and I see 7d's on the market every day ranging from 450 to 500€.
The 7d has a dated sensor but it's really not THAT bad and it makes up for it with a wonderful easy to use body and pro features. Features-wise and usability is pretty much a 5d III, but with a... 650d? sensor.
Though if size and weight is a concern to you, and the type of shooting you do doesn't really require large lenses, tough body and stuff like extensive flash system support, go for a mirrorless camera. The already suggested A6000 is wonderful.
But remember that if you're going to stick a large lens on it, might as well get a DSLR. At least you get twice or more the battery life and a good optical viewfinder (Good if it's not an entry camera, mind you.)