Question regarding 450D

Dear all,

I am about to buy Eos 450D as my first DSLR and I have one question regarding the lenses I am about to buy with it.

Since this is my first DSLR I am not so picky regarding the lenses. I mean I want the good stuff but at this moment it is not the priority to me. I want to start basic and upgrade as I advance in the DSLR world.

So I will ask you regarding these two lenses that I will get with the 450D.
first is :
tamron af 75-300mm f4-5.6 LD

second one is:
tamron AF 28-80mm F 3.5-5.6

All of your input is highly appreciated.

thx