I'd do all the suspension at the same time personally. Or at least do the front, then next on the list would be the back.
I would also do exhaust before intake and then intercooler. I would also do the brakes before remap, in fact, I'd probably do them before any other performance mod. And do the clutch before the remap too (Just realised its a DSG, so forget about that).
So, My new look list, in order would be something like:
1) Timing Belt/ Engine Service/ DSG Service
2) Rear Suspension
3) Replace all the mounts bushes dampers springs top mounts etc on front suspension and gearbox
4) Alloy wheels refurb + decent rubber
5) Exterior paint correction + detail
6) RNS 510 etc... (I'm assuming interior mods here, since this will be your most used view of the car, I'd prioritise here too)
7) NSBBK
Downpipe + Exhaust
9) Intake + Intercooler
10) Remap
But that's probably just me. I'd prefer to have the handling and stopping sorted first (so that includes rubber), well, after all the servicing stuff is done. Then, as you spend most of your time inside the car, get that how you want. So stereo (Nav) / clocks / speakers / whatever you want. I put the brakes behind this, as I'm assuming your brakes are fine as is. If they are not, then I'd get them done when they are needed.
Once you are happy all that is lined up and ok, then think about the performance mods. They should really be last on the list, with the remap coming dead last. As hard as that is to do. Downpipe and exhaust will net you the best gains before the remap, so do that first to keep you interested. Intake and intercooler aren't going to come into play until you are actually remapping the motor, so leave them for later. Remap right at the end, so you can just enjoy it at that point, and not have to worry about slowing for corners, making it round corners, engine blowing up etc...
Of course, I am also around 400 miles away from R-Tech (each way), so I'd only really want to make that trip once. If you're just round the corner, then you could do the mapping before fitting any other performance parts (although I would still do the brakes first personally).