"I rather not use the I2C bus, because i think its to complex and the IC are to expensive."
what chips?, read the appnotes at
http://www-us.semiconductors.philips.com/handbook/...es_49.html, they describe I2C uC pin to uC pin without extra chips

"Or can you just simple put the TXD of the master to all of the RXD of the slave's and vica versa"
It all depends on the distance, if all uC's are on the same board, you can (within reason) connect TxD and RxD directly.

"i know there are chips of the 8051 family that have the capability to have a base adress and when that is verified they handle the rest of the data send and if not equal ( adres) they ignore until an new adres pops up"
True for all '51 chips, but software required.

Questions:
how far apart are the uC's?
How many?
Master/Slave or Multimaster?

Have fun,
Erik