Building an audiophile amplifier with ultra low distortions and superb sound is really  easy with Kaltecs Kits
and it won't brake your bank account. You can choose different kits in accord to your personal needs.
The main building blocks are:
 - Ultra Low Distortion Kit  based on LM1875
 - Ultra Low Distortion Kit based on TDA7293 / TDA7294.
By combining 2, 3, or 4 blocks from one of the two kits you can achieve output power up to 250W with extremely low distortions.