Orville it depends on what you'll use it for.
If you're intending to bf, but give the odd bottle or sterilise the odd dummy, I'd use a cold water system - literally a lidded Tupperware tub and some tablets. Very cheap and cheerful.
If you're going to ff from day one, you might as well get a counter top or microwave steriliser. The branded ones are made for their own bottles, but they're pretty universal I think, so if you switch bottles you don't need to change your steriliser too.
I hoped to bf and thankfully managed to, but we'd bought the Tommee Tippee Closer to Nature set too. We got it for about £40 in the Asda Post baby event sale. Worth shopping around as it has everything you need really.
We had to sterilise DD pill crusher and oral syringe, so when we travelled we took Milton tablets and it was fine.
Bf equipment, like pumps etc don't actually need to be sterilised. They're fine in hot soapy water apparently. I tended to sterilise them every few days anyway.
(Sorry - that was much longer than I expected!)