Probably depends on what kind of briefcase you're looking for. I find Tod's to be really overpriced for what you're getting but it can also be just the right thing, depending on what you want.
For bridle leather cases, you can check out any number of traditional English makers. Swaine Adeney Brigg has a really nice satchel model called the Westminster. There's also Ettinger, Tanner Krolle/ RBJ Simpson, and Glenroyal. Just note: bridle leather is a bit stiff and heavy, which again, depending on what you're looking for, may or may not be right.
You can also use smaller makers like @casemaker
. They're not as big as the heritage companies, but they do good work at much more affordable prices. I know casemaker works with bridle leather, but he may also have other materials.
For a softer briefcase, I like Frank Clegg Leatherworks, which you can pick up through them, The Armoury, or No Man Walks Alone (the last two are located in NYC, but can take phone/ email orders). My favorite briefcase was actually made by Frank (it's his English Brief model) and I often buy his bags for Christmas gifts.
Valextra is really overpriced, but nice. They have a model called the Premier Attache that has a very funky 1960s vibe. Probably not to people's taste here, but I like the modern design. They have other, more traditional models, if you want.
Hermes Sac Depache is beautifully made and designed, and unlike many other high-end bags, is hand stitched. Full retail will be higher than your budget, but you can get them slightly used for $2,000. Just beware of fakes. True Hermes products are hand saddlestitched, which have slightly angled stitches (that fall in a straight row). There are a bunch of online guides for how to spot fake Hermes products, if you need. It's not that hard to spot a fake, actually, because producing one that looks even half authentic is difficult.
Similarly, Chester Mox makes handsewn, saddle stitched, bespoke briefcases for a fraction of the cost of what you'd pay at Hermes. The leathers they use are really nice (many are the same as what's used by Hermes, in fact), and the owner of the company was trained by one of the best leatherworkers in the US.
Filson sells a bridle leather satchel for about $750. Style is nice, and more affordable than some of the companies listed above. Just a bit more rugged in style.
JW Hullme also does nice, rugged American styles. Much more casual than the other stuff mentioned above.
Glaser does good work in San Francisco. Available for custom orders too.
Ghurka is OK. They've gone through so many iterations. The the first line was great, the second iteration was less great, and the third iteration (which is where they're at now) is a mixed bag. On this third round, they've brought some of the production back to the US, which is nice. I would opt for their "vintage leathers," which aren't actually vintage, but they're nicer than the mainline stuff IMO. More expensive though. Style is again a bit more casual (old British correspondent style stuff). On my last flight, the guy next to me was carrying a really nice briefcase. I asked for the maker and it turned out to be an old Ghurka.Edited by dieworkwear - 10/12/15 at 9:02pm