Long version.
People do run Logic and Photoshop on the base model Macs, including MacBook Airs, but I'd suggest going for one with an i7 processor if possible, failing that the fastest i5 you can get. Don't worry about a graphics card unless you intend to play games or maybe video-edit. HD4000 or the later Intel video chips handle most things, including HD video, fine.
16GB of RAM is a good idea, as is a Retina screen - they are spectacularly good.
An SSD speeds things up nicely, and Apple use good and very fast Samsung MLC ones. There were problems raised on forums regarding the hybrid drives and low-latency audio when hybrids were introduced, but that seems to have been fixed.
Avoid the one just called "MacBook" - that single power/USB socket is fine if you're the kind of really hip and cool person who never uses an external anything because you can't stand the idea of your trendy empty desk being cluttered up with horrid wires but for DAWs or any use where you need external storage, the more sockets the better.
Don't pay Apple prices for external drives, especially Thunderbolt ones. It's way cheaper to get a Thunderbolt enclosure and put an SSD or HDD in it yourself. Avoid the USB+Thunderbolt ones, they are usually a USB enclosure with a Thunderbolt socket tagged on - and if you use an SSD in one you can't send it TRIM commands because USB doesn't support TRIM< only Thunderbolt does. Though for most real-world uses an external bus-powered USB3 drive is pretty quick, though I stream audio from Logic to a Thunderbolt enclosure with an SSD in it. If you go down the external SSD route then you will need to enable TRIM on it - which is easy to do.
Or the short version - for a desktop it's the highest specced 21.5" of 27" Retina iMac within your budget. For mobile use I'd suggest the highest specced MacBook Pro that's in your budget, but don't spend extra on the one with a dedicated graphics card unless you need it. And get a Magic Trackpad 2.
It might be an idea to wait a little, Apple may be about to update their range, and the current MacBook Pro is maybe a little under-specced in the cpu department by current standards, though OS X/MacOS seems to run smoother/snappier on a given hardware spec than Windows does.
And keep an eye on the Apple online shop for refurbished Macs. At the prices Apple charge a 15% discount can come in handy and the refurbs have a full warranty and it's usually difficult to tell they've ever been used at all.