While plasma might be great for some you have to consider your own set up and wants from the TV. There are pros and cons of both plasma and LCD and you need ot make that decision for yourself.
PLasma on the plus has awesome rich blacka dn dark colors while LCD and LED have better whites and bright colors.
Plasma due to the type of tech is inherently faster in refresh rate though 90% of people dont notice much lag on current 120hrz and up LCD/LED
Plasma has a glass casing which if you room is like mine with large picture windows causing glare which is unacceptable for most. LCD/LED due to their coatings have less of an issue with this.
Burn in and set life spans are not really an issue any longer. The pixel shift tech in plasma negates most of that unless you leave your TV on CNN or something for a week solid.
All of that said there is one serious downfall to plasma and that is the lack of support and models moving forward. While there are the diehard Plasma people it seems the consumer market has shifted to LCD/LED and this does not bode well for future plasma models. Samsung for instance has discussed cutting plasma the past 2 years but continues to make them and will do so for at least another year. While most do not have issues with plasma it is somethign for you to keep in mind. The general TV consumer though would be happy with any type of large flat screen these days though...
For BluRay - PS3. A lot of the cheap blu rays are great for today but lack the space and resources to fully update their firmware with the new codecs and such with bluray. The PS3 is fully able to update at will, plus you get an inernet device, multimedia hub, and gaming machine in one. It really is a fine centerpiece to a home theater setup even if you never use it for games.
Surround sound. This all comes down to personal preference and what you are going to use it for. HTIB (home theater in a box) are fine if you only want to pump up the sound slightly and potentially hear a bullet whiz by you. Most of these are no upgradable and you have to scrap the entire unit shoudl something break or go wrong. The inputs are severly limited as well so you are stuck and not well future proofed.
The ONLY HTIBs I would recommend are package deals in a sense in which a dennon/onyko/yamaha reciever is packaged with speakers be it klipsch, boston acoustics, or Onykos own brand. These are great sets for most people and are fully upgradable down the line shoudl you chose. Since these packages are a full blown reciever you get all the benefits of buying single components (though the recievers are normally mid grade and you will lose out on some of the high end features it does not sound like you need them and again you could always upgrade later)
All cables buy from monoprice.com and not from ANY retailer as they severly markup the price and it has been proven that there is no difference between high end monster cables costing 100+ and the $3 cables on monoprice. Dont let a sales guy tell you otherwise. Make sure to get speaker wire on monoprice as well as the wires in the packages and such are small guage and crap IMHO. Normally give you 18 guage wire when you will want 12 for most systems.
Wireless speakers are nice in that you dont have cables running across your room under the carpet or such BUT they still need plugged in and there is still a wire from that hub to them. The quality also diminishes with them as oposed to wired speakers.