ARDUINO based programmer

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programming

Dear Sir or Madam,
I’ve read some publication about ARDUINO, but did not yet work with them. Now I plan to work on project in which I think I’ll use this device. There is short description of project. I need to make programmer to program external device with parallel port connector, be able to write to device, to read content in it and make necessary correction. After preprogramming this device(s) will be connected to regular computer parallel port and will work as a dongle. So I’m asking for your advice – witch model(s) of ARDUINO are best fit my requirements?