I use the Sigma APO too. I also recently bought the Tamron 1.4x teleconverter for 79$ at B&H and very pleased with that.

my galleries with the APO:

http://www.pbase.com/zylen/sea_world_300d
http://www.pbase.com/zylen/300d_birds
http://www.pbase.com/zylen/animal_portraits
http://www.pbase.com/zylen/300d_portraits
http://www.pbase.com/zylen/macro_with_sigma_70300_apo
http://www.pbase.com/zylen/san_diego_zoo_300d

and the Sigma 70-300 APO with the 1.4x Tamron TC:

http://www.pbase.com/zylen/sigma_70300__tamron_14x


Erik Aalund wrote:
> I'm about to buy the Canon EOS 300D with the original Canon 18-55
> lens.
> Futhermore I would like a zoom-tele, i.e. from Sigma.
>
> My photodealer has told me that the Sigma 70-300mm 4-5,6 APO Macro
> Super is a very good lens and I have also been looking around the
> Internet and found a Sigma 55-200mm DC.
>
> Which one do You think that I should go fore together with the
> Canon EOS 300D?
>
> Erik Aalund
> Denmark

--
I am not an English native speaker!
Please email me at forum300d@hotmail.com for questions
www.pbase.com/zylen
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