http://www.astraweb.com/ is the best priced, but they are still updating, so to speak, so in about 8 months they will be the best, period. For now giganews is the best, but overpriced.
That unlimited bandwidth shit doesn't even matter anymore since almost all hosts have that shit for hella cheap (giganews excluded), if you downloaded like 3 movies a month then you could get a block plan, but fuck that.
If you can afford it go with giganews their servers currently hold the longest retained files; but like I said in about 8 months astraweb will have caught up with them and will be 1/3rd the price and will rain supreme. The reason I suggest giganews is that since you are switching over from faggy p2p you will prob do alot of downloading and will go for files that no other newshost has on their servers. Its a common occurrence with usenet nubs.