Suggest you go to Richer Sounds and/or Superfi and listen to some. If you buy floor standing then should be no need for a sub but if you get bookshelf then probably will.
Great advice that man.
I spent 3 hours at Superfi in Manchester last April. I bought an amp, speakers and iPod dock.
I had short listed NAD, Marantz and one other (I forget) for the amp. The speakers were Mission's, Celestion (not so good today but in the 70's they were top class IMO) and Tannoy.
I bought NAD and Tannoy, the iPod dock was quite expensive but worth every penny for the difference it made.
Listened to all types of music over different bits. Oh man what a day myself and Joanne had.
I bought Joanne some Mission's from Richer Sounds later in the year on Bury (old or new I forget) road and they too were really good.
She drives the Missions with the old 70's/80's Rotel amp. Actually Richer Sounds commented on how good hi-fi was from back then. They sound incredible with the Rotel
I have bought some retro Yamaha, Denon, Rotel and NAD equipment off eBay (I went a bit mad and have more stuff than I need) and some Denon labelled bookshelf speakers which are quite good Celestion I think.
Go and listen to stuff GD if you buy new. My eBay exploits went along the line of if it sounds **** when I buy it I can sell it again. Sold some of it