I understand what you mean about feeling "a bit cheeky" going into a dealer and trying something that you probably won't buy,but in all honesty I am sure many of us have,and short of paying full price for a new item,it's expected. The type of amp and speaker combination really will be influenced by your choice of music,and my tastes also run to jazz and rock,for which I find a detailed,but not overly forward sound works well. You should try as many as you possibly can,and any of those mentioned already(Bryston,Krell,Audio Research,Parasound etc) would be a good choice,in that none of them are likely to give you problems with sound character(irrespective of what some may have to say about Krell)and all are good,powerful and load tolerant amps. You may also want to include some of Tact Audio's more recent amps,and those from PS Audio,all of which have had good reviews,and the Tact amps are very easy on the ear as well as being detailed and powerful.