You have a wonderful pair of speakers, and unless they are really beat up you got a great bargain. I have demo'd many other speakers in my home, including a pair of JB Lab Micro Utopia's and have continued to be very impressed the the 52SE. I actually have been in the process of upgrading all of my components as the little Dyns seem to have no end to their musical ability. On a trip to the west coast I had the opportunity to audition the Dynaudio 52se head to head with the Contour 1.4, all with the same electronics. They were almost dead even with the exception being that the 52SE seemed to image better and the ability to hear individual instruments was better. Of the three of us listening; me, a friend, and the sales person, the 52se won three to zero in which speaker we enjoyed the most. My friend had no idea of the cost difference!
Well, as for electronics. I was initially running mine with a Rotel RX-1052 stereo reciever. I was very happy with it but recently upgraded to a Creek Classic 5350SE which I think is a gem. Don't hesitate to get good electronics but if you are on a budget don't worry. The 52se's are worth amplification upgrade in the future. I also wouldn't worry about the Dyns needed a lot of power. With the first order crossover I find them easy to drive. I my even upgrade at some point to a VTL integrated amp with about 60watts in 4ohms. I have heard the combination and it is breathtaking.
As for source. I have been very happy with the Rotel 1072, very black background, good balance. I think that there is a used one on Audiogon and I know there will be another for sale soon. I have recently upgraded to an Arcam FMJ33 which is wonderous. This gives you a bit of my view of the little Dynaudio 52SE, I do not think that a $2500 CD player is overkill for these little speakers yet one will be very very happy more affordable electronics.
As for cables, I found the Nordost gives the best balance of warmth, soundstage, clear highs and bass. I use the SuperFlatline MK II as well as Solar wind interconnects but may be going to the Blue heaven for the CD player.
Oh, get good stands, 24". These speakers will have a much tighter, deeper base with good stands.
Congradulations on your Dyns. I hope that this is helpful.
dav