I've just relistened to the Naxos 8th, and now know why I don't listen to it much - it's really tedious (except the 3rd movement), and I wouldn't have got to the end of it if I hadn't wanted to give it a fair crack. The orchestral sound is also pretty distant....so definite thumbs down on that one from me. From the reviews that looks one of the weaker ones of the series though. Turns out Gunzenhauser is American. (I got it s/h for 99p, so I got what I paid for)
The way I read the Penguin review is Pesek is good/fair for 7 and 8, but a bit routine in 9, and poor for 6.
The reviews of the Belohlavek/Czech/Chandos (note I spelled his name wrong earlier) set seem pretty good, particularly 6th and 8th (he also recorded 5th and 7th for them too). Disadvantages there are that a) they're full price; b) they come at one symphony per disc, so it works out expensive, but you get the tone poems as couplers; c) there's no 9th, although there seem to be two Supraphon recordings of that by the same team (look like they may be the same recording), one at full price and one at £5.
If you want the full Czech ticket it looks like Neumann or Belohlavek.
Doesn't meet any of your nationality spec's I'm afraid, but I grew up with the Davis/Concertgebouw/Philips 7th which I think is wonderful. I also have the Davis/LSOLive 9th, which is excellently played but, as with most of that label, the recording lacks atmosphere and ambience (despite being recorded live). The principal reccos for the 9th also seem to be non-Czech (e.g. Masur/NYPO).
And just to further add to the confusion, I've just seen a review of Kubelik's versions of 7-9 (recorded live) with the Bavarian Radio Symphony Orchestra rereleased on Orfeo that the reviewer (Rob Cowan, a fully paid up recordings anorak) rates clearly higher than the Berlin versions ("In short, it lives more"), with the probably exception of the 7th.
I get most of my new discs from
www.mdt.co.uk - they normally take about a week to deliver.
Hope this helps
[Edit]
Actually, how about a "do it yourself anorak kit":
6 + The Wood Dove : Belohlavek/CzechPO CHAN9170 £11.50
7&8 Kubelik/BPO DG 4579022 £7.00
9 + In Natures Realm, Othello : Ancerl/CzechPO Supraphon SU36622 £7.00
and/or
9 + Carnival, Symphonic Variations : Belohlavek/CzechPO Supraphon SU36392 £5.00
You can also argue that the 7th is so heavily influenced by Brahms that the full-on slav tratment is inappropriate anyway - and a Czech exile in front of a German orchestra is probably just about the right mix

.