click here and I think that Perfecta Ultra Pro 5100, Perfecta 5100 Pro + 256Mb RAM (total 512Mb) will be suitable for your needs. You may want to opt for the Suntek Acrylic case which has a FIREWIRE port as well for quicker data transfer of your images.
You'll need a TFT or LCD monitor to display your images clearly and to reduce eye strain. I think that 17" should be a suitable size for photography. click here