Cnoel:
Like "Elevick", I also like your taste in equipment. Your system sound strikingly similar to mine, only mines is anchored by an audio/video receiver (a Harman/Kardon AVR-210) instead of a separate pre/pro and amp setup like your setup is. I too have a Panasonic 27" SuperFlat Television (the TOL CT-27SF37 from 2000..... great picture and nice sound...... the best picture (so I think) aside from HDTV..... and the sound isn't all that bad either..... too bad it is not a HDTV ready set.... because it's a great set other than that) and a Toshiba DVD Player (a SD-2700 which I purchased in mid-to-late 2001), and so far, I haven't been disappointed with my setup. I also know what kind of picture my TV can really produce because before I got the Toshiba DVD back in mid-to-late 2001, my "telly" was connected to a Pioneer Elite DV-37, during which, it has produced a strikingly sharp picture. So I definitely know what my TV is capable of. I am also planning to purchase a used Sony DVP-S9000ES DVD Player sometime in mid March or early April (I am scoping the net for one as we speak), and when that player arrives, the Pioneer Elite DV-37 will return to my home theater and I will give the Toshiba to my girlfriend.
But anyway, I think all of your choices are very fine choices. Personally, I wouldn't change a thing. Just remember that when you get your next TV, make sure it is a high definition model, that's all.
Like I said, I like your system the way it is now. But when the basics are in place (like the speaker system and the electronics and cables), I would take a strong look at the Sony DVP-NS999ES though (here is where I disagree with "Elevick") if you have enough money leftover to purchase one. Even though your current set may not make full use of that player's capabilities, what you would be doing is using that player as a dual purpose player. You will have a very nice DVD player to play your DVD movies on now (stretching the performance envelope of your Panasonic SuperFlat (which I know from personal experience)), a very nice CD player in which to play your CDs and your SACDs (god forbid if you should decide to take the plunge and try this new format out), and thanks to the DVP-NS999ES' progressive scan capability, you will be ready for a HDTV when you purchase your next TV in the next year or two. You'll already have a player in place that will make the most of your new TV. All you have to do is make the appropriate adjustments.
As for speakers, if you like the B&W 600 series, then why not go with the bigger 604's as your fronts and use your existing 602s as the rears/surrounds??? You'll already be a step ahead of the game that way because you already have the 602s. If you want to round out the system, I would spend that extra money on a good subwoofer instead (a Sunfire True Subwoofer IV, an REL Strata or Storm, or one of the Velodynes in the HGS series would be ideal).
Just something for you to think about for a little while. Good luck hunting for that house.
--Charles--