Hi nick1 and welcome to the forum, your first question is difficult to answer, we don't know what type of dish you intend to buy, whether you will want to motorise it, roughly where you live and your level of computer knowledge. Oh and a small point, how much do you intend to spend.
I will in the first instance, move this to the digital systems section.
i would look for someone local, just in case you need to get back in touch for support etc... ring round and ask about the Dreambox, and see if they have fitted one before.
i for one found out the hard way, that fitting a satellite system and a dreambox are 2 different things..... simply because the Dreambox is more software than hardware.
i personally would get a dreambox system and ask lots of questions on here, and learn as much as possible...... in the end you will be really happy with what you have spent your hard earned cash on
the main differece between a normal receiver and a Dreambox is the ability to emulate cards and cams, so there is no need for wafer cards and programmers. you can simply plug the dreambox straight into a pc and update channels etc direct, and the dreambox can also go onto the internet through your PC connection so updating things and installing plugins etc, can be done with the remote control in the comfort of your living room.
i would also get a 1.1m dish too.... you will still beable to get all this for £600