Hi, which Samsung model is it you are looking at on Amazon?
If you think you may end up going for after market cartridges Samsung certainly don't make it easy these days, and the frequent firmware updates (that do pretty much nothing except lock-out aftermarket cartridges) are a bit of a pain.
A small laser can be a great solution for printing out documents rather than pictures, and the little Samnsung's are as good as any if you plan to stick with OEM cartridges.
The Dell 1320c as recommended by Mightymarmite is a great little machine if you can get your hands on one. Small (2,000 page yield,) hasn't had any firmware issues with after-market, re-manufactured cartridges are readily available, but the quality as with most of these smaller lasers will never be the same as ink. (I use one in the office on a daily basis from printing invoices etc no problem.)
Others I could recommend
HP CP 1215 (1200 pages black, 1000 colours cartridge code CB540a, CB541a, CB542a, CB543a)
The replacement for it
HP CP 1025 (1200 pages black, 1000 colours. Although you might not be able to find remanufactured cartridges for this easily now, my company has released the products and they will be across the market place very swiftly.)
HP CP 2025 if you want something a little larger (3500 pages Black, 2800 colours. )
Obviously I could go on and on, but feel free to pick my brains on particular models.
Please bear in mind page yields are based on an industry standard of 5% print per page.
If it interests you for either financial or environmental reasons the re-manufacturing industry has come on a long way in the last 10 years, all our product for instance are quality guaranteed. As I have discovered since coming in to the industry having the latest printer is not always the best thing as it can take 12-18 months for after-market to become available.
For big HP inkjets although ridiculously expensive produce unmatched print quality, so horses for courses.
And to answer the other 2 of your questions, no the laser doesn't churn out anything nasty (I can provide you MSDS, or Reach compliance on dozens of different toners to quell your fears if needed.)
Yes you can put photo paper through them, and you will still see improved quality although not as marked as ink on to paper.