I recommend San V12 over other creatines
It is a very good product and will get your test levels up. For plateaus I find test boosters more effective than creatine, but people respond differently to creatine dependant on your natural levels. The combo of the two will defo work for you though if the only supps you have used is Instant Whey. I would recommend SAN V12 (especially orange flavour) as it is by far the best on the market at the minute, when ever you hit a plateau the first thing to do is eat more and alongside the above products, you have then got a win formula!