Here's an entry level setup:
Receiver: yamaha rxv359 - P11K, the rxv459 is P14K-15K, the rxv659 is P27K
Speakers:
Fronts (L and R): wharfedale diamond 9.1 bookshelf - P5500 per pair (these are sometimes referred to as the best sounding speakers for under $500, or was it $1000)
Center: wharfedale diamond 9.cs (or cm) - P5000
Surrounds: wharfedale diamond 9.DFS - P5000 per pair.
That gives you 5.0
For the .1 ...you'll need a subwoofer...would suggest Velodyne, but it is pricey...P24K (8") up. Some might suggest
DTX...maybe around P5K-P8K...
Whatever sub you choose later in life
If you want to shake the sofa, the room, the dog outside, you need a sub that can do an SPL (sound pressure level) of 75dB at 22Hz minimum.
If you want to delay the subwoofer, get floorstanders instead of bookshelf.
Floorstanders have better bass than bookshelf. You can check out the wharfedale 9.5 (P12500 per pair)
And as suggested, you may want to check the buy and sell area...some people are upgrading, so they sell
their older stuff at a good deal (sometimes).
And before you buy, do try the speakers first (listen to them),
see if they are a big improvement over your logitechs for the price you will be spending
Unlike PC speakers, the reputable hi-fi shops will ALYWAYS demo these to you before you buy them... just think shoes
Finally, no matter what you buy, no matter how expensive the toys you get, if the room is acoustically bad (ie. untreated), you just wasted money
If your source DVD discs/material/media is also bad (ie. f*kes), then you also wasted money on equipment.
Actually sir i have logitech z5500, what exactyly kind of yamaha receiver and wharfedale speakers ang pang entry level 5.1 setup lang?