I echo the sentiments of paying less. A 450d is plenty decent to learn photography with.

I personally would recommend a used 5d mk2 or mk3 for the benefit of being able to buy full size lenses.

And before you start messing about with cheap nasty zooms get yourself some primes . A good 50mm is an essential inexpensive lens and indeed you may find you use it way more often than any zoom and even a cheap one will be sharper and faster than all but the super expensive zooms.