If your not fussed about multichannel surround sound then your proberbly wise to focus your money on the stereo gear for now, you can always add something like a Yamaha DSP800 to your setup at a later date for the centre speaker and the rears. only around £70-£80 on the bay.
You defo wont need a sub with a decent set of speakers, a cheap sub will just ruin the sound you will hear, again, if you catch the movie bug you could always hook up a decent sub at a later time.
You havent said much about what style of presentation you like, most brands have a certain signiture style, and with hi-fi sound being such a personaly prefrence some people will love one amp, others will hate it. thats why you should always listen before you buy.
if thats not possible heres a few goodies.
AMPS
Roksan Kandy III - around £200 - £240
Huge power and very exciting sound, I recently upgraded to this from a cyrus III and am loving it. great dynamics, tight bass and sweet trebble.
Cyrus III - around £160 - £200
Really clean and detailed sound, very taut bass, can be a little dry when matched with bright speakers, great build quality though and looks stunning too.
Naim Nait 3 - around £200
Dont let the looks put you off, great sounding amp, a real classic
Arcam Alpha 7, 8 or 9 - around £70-£250
Again another classic, the 7 can be had really cheap, the 8 is a lot better then 7 and worth the upgrade, as is the 9 over the 8. all are very capable amps. They produce a much richer sound then all the above amps, still plenty of detail just make sure you partner them with detailed speakers. I picked up an aplha 8 for my dad, gave him my old mission 751 speakers and the sound is fantastic.
I cant comment of any rotel stuff because I havent heard it.
I have heard a couple of NAD amps, but only there cheaper range, around £250 new, they were nice, a little safe sounding but very nice all the same.
Audiolab gets mentioned a fair bit round these parts, it was a bit of a classic in its day but its just not my cup of t, I did listen to one before I bought my old cyrus III amp. I just found it far to dry and detailed, it bordered on being shrill, very tiring to listen to. I did have the 751 speakers at the time which were bright to begin with.
Speakers
Monitor Audio bronze B2 - around £140 NEW off the bay
Really nice bookshelf speakers, look and sound great fro there price range, very detailed and lively sound
B&W 601 S3around £170 to £200
Again this speaker gets mentioned a lot, its a love it or hate it speaker really, its really lively, huge bass and very forward, if your into dance music then you will prob love it, make sure you get the S3 though, early ones had a very harsh treble.
Mission 751 - seem them go for under £50
dont come up very often, and when they do they go for silly money, they are worth far more (hence why I gave my set to my dad rather then selling them) when my old set recently blew (due to my own stupidity) I took them to my hi-hi shop to ask if they were worth repairing or should I upgrade, he said I wanted to get anywhere near the sound I would have to spend at least £500 for a new set of speakers.
I really cant rate these enough for the price, granted they look a little dated, and with rubish amps they sound carp, but stick them on the end of some quality electronics and the shine.
other goodies are Epos, wharfdale 9.1
The only other things I would suggest is to save some money for speaker stands and cables, they make a huge differance, dont have to go crazy but you will notice a differance if you get any of the stuff iv mentioned
Van Damme blue speaker cable is cheap and well regarded
Mark Grant interconnect - best £25 you will spend on your hi-fi