Well the latest entry level for 3 major manufacture is
Canon EOS 650D/Rebel T4i
Nikon D3200
Sony A37
Nothing wrong to buy older model if you think you cannot afford the new one.
I think Sony one have the best quality:cost ratio but it also slighlly different compare to "mainstream" DSLR like Canon & Nikon. mainly because it use digital viewfinder instead optical viewfinder. there is quite debate about that however I dont think it really matter for beginner like you.
alternatively you can go mirroless which offer interchangeable lens and (roughly) similar performance in smaller package. thought it have less manual control.
most of used camera is "good" so i dont think there is lot of problem with that if you want to buy it used
My advice is to go to local shop and try some of them before deciding to buy it. so you can feel stuff like the weight and viewfinder
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