welcome to ******** forums.
it depends what is your purpose, budget and target. If you just want to watch FTA (free) channels any receiver will do, if you want to watch some enctypted channels and budget is limited then go for normal recivers which costs arround 60 to 100us$ and can open encrypted channels with firmware upgrade and key input. If you want to watch those encrypted channels which are only available on Card Sharing like nova,showtime etc then you can go for Humax 5400 and if you wana explore the Reciever compltely like an enthusiastic then go for DreamBox (it is the most flexible receiver due to its embeded linux OS and availablity of more plugins/addins) and also supports card sharing.
and finaly if you wana enjoy satellite internet (1-way or offline data grabbing) also as well as watching thd digital satellite tv then go for a PC DVB Card. this will alos give you an option to record the tv channels directly to you PC and later burn them on cd's/dvd's.
any more info ?