Re: 40/48 spoke wheels. I only would consider them if sherpa loaded or running a tandem. However many quality 40 and 48 spoke rims are still on the market, hubs are bit harder to find. Only bikes I currently own with 40 spoke wheels are my old Raleigh 3 speeds. I typically run 36 spoke wheels on everything else, have not broken any spokes in years, and I am no lightweight my current city bike (with redone handbuilt wheels) fully loaded with me and groceries tops out over 300#.
Aaron