You can try them out and decide for yourself. I would suggest trying APR first, which is the priciest option, and then trying a cheaper alternative to see if you get the same, similar, or better results. Just make sure they return your ECU to its original software before trying another tuner because it makes life easier for us to deal with an ECU in its original state (ie. self-cancelling 6 hour trial leaves APR code behind in the ECU).
We are doing our $880 SRS-II Bundle still (SRS-II Handheld Flashloader + 2 x Tunes) which comes with a 14 day evaluation/money-back period so I think that's a pretty good deal but I'm biased. Feel free to shoot me an email and I can provide more details.
As for CAI, it won't make dramatic differences to the performance, so I would be wary of spending >$500 on one - of course they do sound nice though, and really it just comes down to personal preference. My advice would be to save up for a high flow cat/downpipe combo instead.
As for the DSG, I personally think it's pretty well sorted in the R, and you'll find most don't bother with a DSG remap. I'll let others chime in on this one though.
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