First off, don't get an RF-603 if you're going to get an RF-603. Get an RF-603 Mk II or RF-605. :) There are some big advantages to the RF-603 II over the Mark I version, such as being able to be used on non-Canikon hotshoes, having an on/off switch where you can reach it when a flash is sitting on top of it, a locking ring on the trigger foot (great if you want to stack a flash on top), a much higher sync voltage limit (300V vs. 11V), and the test button now works with the trigger off the camera hotshoe (good for use with external light meters). The 605 added group control.
But I'd still say get the 560-TX.
Remote power control might not seem that useful in a macro situation where all your lights are relatively close-at-hand, but having remote power/zoom/group control over your lights can be handy with certain types of modifiers, like, say, a Westcott Apollo softbox, where you have to open the softbox to get to the flash. And the LCD screen makes it easier to see what your lights are set to. And, of course, the more lights you end up using, the more convenient it gets when you have remote control. For a $15 price difference, I think it's worth it. YMMV.
I will also caution you that going down the Yongnuo path is great if you're a hobbyist, but less so if you're planning on going pro and need to grow/expand your system. Yongnuo's triggering systems don't play well together. The YN-560, YN-622, and RX triggering protocols are all kind of mutually exclusive. If you want to switch triggers later on, you have to do it wholesale, not piecemeal. Other systems, like triggers from PocketWizard, RadioPopper, and Phottix are better at having manual and TTL triggers that interoperate, and can have a toehold in the studio strobe and Sekonic meters as well.
See also: What are the Yongnuo flash naming conventions? for information on the YN-560IV and YN-660.