@Count de Monet: Interesting point about your tweed combinations and the Strand. I don't wear my Strands with many tweed combos either. Only one, now that I think about it.
Yes, and if I wasn't clear, I was only speaking of the walnut Strand. If I were wearing some sort of tweedy combo and wanted to wear something that light, I've got a Ravello blucher or my walnut grain Macneil LWB's. So this time of year, the walnut Strands collect a lot of dust.
@Captm2016 I don't know how to answer your question about the Cambridge. I'm a "wingnut," loving both shortwing oxfords and LWB's (and owning too many) and getting a wingtip in burg / #8 shell was sort of a grail thing for me. Plenty of purists would tsk tsk the idea of any shell shoe for a business suit oxford but I couldn't help myself. I don't wear them on true CBD days but the Cambridges and the brown calf Jeffersons are 1 and 1A otherwise. I especially enjoy them both with a navy flannel suit I have.
Right now if I were you, a dark brown oxford would be my top priority. I'd lean toward a punchcap (Fifth Ave) if for no other reason than it giving you a more conservative alternative to your black PA than your bourbon PA provides. If you think it likely that "one of these days" you'd opt for the burg Cambridge, I wouldn't get the merlot McAlister now. Put the money elsewhere, like a boot or a suede chukka or (gasp) save your money.
Of course, two iconic burg shell shoes - at least in the American trad tradition - are a shell LWB, a/k/a a @#$%^& gunboat, and a burg shell loafer. Both of those are very versatile shoes. So if you want to address suit needs now, but still want to save toward something in #8 shell that will cover a lot of ground, maybe write down either (or both) of those on your longer term wishlist and get a merlot McAlister now along with a brown oxford. Then you'd have oxfords in black, two shades of brown, and merlot.
If you haven't come across the semi-famous Six Shoe Thread, http://www.styleforum.net/t/338954/streamlined-shoe-wardrobe it is a good read. Maybe one of the best takeaways is how mapping out a plan when your dress shoe collection is relatively small can not only avoid some duplication later, but also lets you spend more per shoe on a smaller rotation. .