It depends on your current setup, your viewing package and what upgraded system you were to choose.
I'd suggest doing a bit of background research then speaking to Sky about your options s and prices.
Generally speaking Sky want to move customers away from Sky+ as it's a legacy, increasingly unsupported product. Sky Stream will probably be cheaper, but do make sure it will meet your requirements - it's broadband based, not satellite and doesn't have all the same channels.
