When u all said good.. good in what sense? Control accuracy? User friendliness? Aesthatic? Higher frequency solenoid valve? Gear judge function? Feedback loop? FIne tunning of boost at different engine load? Auxiliary output port?
I'm using AVC-R myself.. I think that is sufficient for my current purposes as I have not even fully utilised all the available functions. Boost controllers nowadays comes with heaps of functions which I'm certain 9 out of 10 ppl out there are not even using more than 50% of the unit's functions. If u just merely want to increase ur peak boost, just get the cheapest EBC u can find, try to avoid bleed valves (turbo smart) as they are load sensitive and give inaccurate boost level on diff load. But if ur more of a gadget/gimmick geek that wants to finetune ur boost curve along the rev range or setting different boost level for individual gear, want/don't want a little boost overshoot on initial thrrottle input.. All these could be done by most of the upmarket EBC available..
In Japan, they are in the midst of developing new AVCR. That being said it depends on how much you have to spend and what sort of features you are looking for. No point in paying extras for fuctions that you do no need. :)
Try asking for Go Fast Bits. They came out with a 2 stage one but please do make sure that they are original and not fake ones as fake ones are built with crappy material and therefore are not as good .
Here is a website for it if you do want to read up on the literature. www.gofastbits.com.au
I wouldn't recommend the go fast bits of turbosmart... no doubt those r the cheaper options but bleed valve will never get an accurate control. U will notice on higher gear with load, boost spike could be very significant.. on my previous car with turbosmart.. I was targeting 1bar which I pretty much got it on first gear and went all the way up to 1.2 on fifth....
I am not bias against brands but I would take into account that sort of materials that is used to be make the product as well as the internals of a product. Thought I do think that most JDM brands are good, certain products can be always improved. It all comes down to cost. Best is to find reviews on the net and see if it suits your need.