What kind of speakers 2.1,5.1,7.1?
Be more specific.
As for headsets Sennheiser are very good.
Headsets are very personal i would recommend you try a friends or at least go to a store where you can try some on.
There's nothing worse then having an uncomfortable headset.
Do you have a discrete sound card?
I wouldn't spend that kind of money on speakers unless i did.
Good makes of soundcards are Asus,Auzentech,Creative( Titanium),and Omega and M-Audio.
Speaker wise these are very good as far as computer speakers go
a friend of mine has the older Z-5400 and they sound nice which have been replaced by the link ones
others from Logitech that friends have are Z-2300,and X-540
All listed sound very nice when paired with a quality sound card.
I view Newegg reviews very subjectively Sennheiser's business is headphones and microphones and has been for a very long time.
I've owned a set of hi-fi headphones from Sennheiser and they were very good lasted 20yrs.I now have AKG's but they aren't in the computer product line.
Klipsch Promedia 2.1
You simply can not go wrong with these. Very accurate, all around solid system. I truly have never heard sound like this. I also have a discrete sound card - Creative extremegamer.
Go with Klipsch! you will be glad you did. Visit the website and check out the forums, there you will understand the quality and the following that Klipsch has achieved.