
Jeez, another HDMI cable thread. A short cable will work perfectly well whether it costs £5 or £50 despite what some folks will try and tell you. They might not have "1.3a" etc. stamped on them but the chances are they will pass everything inc 1080p, HD audio etc. I have used cheapo cables from lidl and my mates have ukhdmi and some cheapies from audiovisualonline and all work fine in projector setups. At present I use 1m markgrant and 5m bettercables. None of them cost the earth.
Check out the faq at hdmi.org or bluejeanscables.com which should answer any further queries you have on hdmi.
I have no idea what a blok rack looks like, have you tried the av furniture forum. If you like it, buy it. If it's an online purchase, you can always send it back under distance selling regs.
I personally wouldn't bother any bluray player other than the ps3 at the moment. While the BD30 is no doubt a decent machine, it isn't profile 2.0, you would have to wait for the BD50 etc. for that. The whole bluray market is a mess with different profiles and hd audio specs. The BD30 requires an AV receiver with HD audio decoding as it can only send it out as bitstream. Again

but that's just my opinion. I would get a PS3 and use it as a bluray player, games console, internet device, media streamer etc. and then if you feel the need to get a stand-alone wait until the profiles etc. are sorted, the technology settles down and most of all the prices drop for the darn discs!
The Onkyo 605 was well received and discounts should be available on any that are left around. The 606 adds some more hdmi inputs and upscaling from what I remember. There is a review over on what hifi's site (if you believe reviews!)