Bhagwan mentioned yesterday that the chain is as strong as its weakest link, which seems intuitively correct. So a 6 lac speaker will probably show up the limitation of the 50k transport much more glaringly and will force you to upgrade. On the other hand, a mismatch by having a 6 lac CDP on a 2 lac amp and 2 lac speaker will reduce everything to a 2 lac per component level, and if you haven't heard better, you will probably be satisfied. I personally believe in having at least one component far above the level of the rest so that when upgraditis hits me, at least I don't have to upgrade that component. Upgrading everything is painful and amounts to rebuilding the system rather than evolving it.
Definitely my experience too. A great amp and speakers will be very revealing of a source's shortcomings. I too, from experience, believe the money is well spent in getting the best source possible (this need not be the most expensive component in your chain though as the prices of great sources are coming down rapidly). However, it makes no sense IMHO to have a system so unbalanced towards speakers and amp.