£350
You can certainly spend that if you want, but IMO it'd be a total waste of money.
There are quite a few ways to do it, none of which involve spending more than £100 tops.
You can agonise over whether to connect via the TV or the VCR/STB directly, but make your own phono cables, and it's cheap enough to do them all. You also get exactly the length you want then!
Personally I think the SA speaker cable is a waste of money - I'd use Puresonic 7845 at 1/4 the price (similar design really, but no silver). My position is that you'll not be able to hear any difference - others disagree, so it's up to you really.
You'd also need 3 SCART cables for the VCR and STB (VCR-TV, STB-TV, STB-VCR), but I'm assuming you already have these.
Wouldn't go overboard on them though if you haven't (CPC do decent ones for this purpose for less than a tenner each)
I'd buy (from CPC) something like:
10m Puresonic 7712 audio coax - £10.47 - CB01855
4 packs of Profigold 7mm phono plugs (16 plugs in all - 4 in a pack, £3.44/pack. These are solder type (plenty of alternatives if these aren't in stock - try CN02214, generic type at 46p each, or CN02385/CN02386, Nakamichi Red/Black)
OR
16x CN02367 - screw type phomo plugs - £1.50 each.
3m Image 1000 Digital video coax - £0.85/m - CBBR6419 (state you want a 3m cut length)
Sufficient packs of Puresonic 7845 speaker cable
10m - £12.17- CB01875
5m - £6.19 - CB01874
Banana plugs as required
£0.65 each (say 24 of) (CN06916 Red, CN06917 Black)
And a SCART-SCART for the DVD-TV connection - a good one is needed - individually fully screened , preferably metal plugs etc etc. As you like Profigold, how about a PGV7000 Oxypure SCART-SCART cable for £19.83 +VAT, AV07506.
And Superfi would have you believe that their £40 internet offer for the same cable is somehow a good deal
If you need SCARTs for the VCR/STB etc, then something like AV07375 is more than good enough at £10.52.
All prices are plus VAT.
Comes to around £90 all in, assuming 2x10m and 1x5m packs of speaker cable are OK.
Add a tenner if you'd prefer screw type phono plugs instead of solder type.
Spend the other £250 on DVDs
If you don't fancy the DIY approach for the phonos, you could also get premade phonos, which are fine for just a few quid each. The plugs may not be as good though, and they won't "look the part", but sound wise, you'd probably never be able to tell.
AV01119 - 1.5m stereo phono lead £2.65 each (3 of)
AV02029 - 3m phono lead £2.14 (digital audio lead)
AV01123 - 2m phono lead £1.96 (subwoofer)
If you'd like a "make"
Then you can also get Puresonic and Profigold premade leads
eg
Profigold
3m DA cable - AV03944 £6.48 (this retails for £25 as the PGD483)
3m sub cable - AV04603 £7.12 (this retails for £20 as the PGA4103)
Puresonic
5050a - 1m - £6.15 (retails for £16.99)
9020A - 1m - £16.65 (retails for, wait for it..... £ 85.99 hahaha)
Not that the price is really any indication of the quality really, but it does demonstrate some of the ridiculous markups which are put on cables!