I know we all want to have that nice new system, but I suggest an alternative to both. Why not add and change over time? This lengthens the time of shopping and enjoying. I recommend a maximum of 1 upgrade a month. That way every month you get a new toy to enjoy. Usually this fits in a normal budget. I do think it's better to wait until your HT is built to audition systems in home.
1. Different speakers sound better in different places
2. You will not be limited by room aesthetics.
3. You will have more money.
Few of us can build a full system all at once and it's a really bad idea. It gets you into a cycle of crazing spending that can lead to debt and other bad things.
I suggest you take it slow and take your time. Make sure each pick is exactly what you want.
Plus in a year many of the top brand speakers may be on clearance
IOTW enjoy your TV for now add over time.
Make sure you enjoy every new toy to it's fullest. That means instead of shopping for new stuff. Watch movies on your new TV. You have a 58" plasma for crying out loud. If you just got it you should be enamored with it.
Oh and Don't listen to people at best buy. I don't like Klipsch myself, but it is one of the few speakers in there store I would allow a friend to buy in my presence.
I suggest you at least give SVS a shot. I would suggest my favorite series(Infinity Beta, KEF iQ), but they aren't exactly easy to audition anymore.
For subs I suggest you take on the Infinity Perfect build on the DIY portion of the site.
With a dedicated HT room you can easily go 7.1.
Checklist of things for a dedicated HT room
Front SoundStage(L, R, C)
Surrounds(LS, LR, RR, RS)
Dual subs if possible(Preferably DIY)
Good comfortable seating(don't forget this)
Cupholders if you like to drink stuff and want to reduce spillage.
Sound Treatment.
Full 7.1 Reciever or Pre-amp/Amp combo depending on the speakers
Trying to think of other stuff. I'm sure others can add on.
Audition List
KEF,
Infinity,
Paradigm,
PSB,
SVS,
EMP,
TSC,
BW
There are many more. I suggest you audition every speaker you can. But maybe after you get the room since you will want it to sound amazing in there.