The NY HR Link is pretty dark, at least to my ears, but they are getting really hard to find in original condition (and "modern" tip openings as well) - an original 7 went for $700 on SaxQuest.com not to long ago. The Florida Slant Sig HR Links have wonderful projection, but again, the price is getting out of this world. Also, the Reso Chamber Links are gorgeous if you find a good one, but again, it's hard to find one in original condition (almost all of the Resos that I've seen have been in #4 tip openings, and they were still going from $350-450!). I had an early babbitt HR Link, but it felt pretty bright for me, but again, every Link is different, this one had A LOT of baffle material in it. I would suggest trying out one of Doc Tenney's HR Links (current model) that SaxQuest.com is selling - they're just as dark as a NY HR Link - real dark, full, plenty of projection, but a fraction of the cost of a vintage Link these days.
Also, Bob Ackerman has been making copies of vintage mouthpieces lately that are really worth checking out. A lot of players in the NYC area have been buying them (a friend of mine just bought 2 of the HR Link copies) - some have been using them as their main mpc, some have bought them as a back-up piece. Theo Wanne also sells a mpc that is like a Reso Chamber (Vibrator Sound Wave) - I have one and it's incredible - huge chamber, dark sound, made from great rubber. I guess what I'm trying to say is that there are plenty of alternatives out there for the "vintage Link" sound without breaking the bank and causing your wife to divorce you... :lol: