Want to shift to ARM from 8051

hi all

i am new to this forum...

i am expert in 8051/52 , PIC and ATMega based projects and products but now i wanted to switch to ARM series..

please guide me where to start... i have Keil 7.1, AVR Studio, PIC Mickro ..... if any of them supports ARM or need any other software???

if ARM can be programmed using SPI interface????

if ARM supports the same C++ which we used for 8051???

regards

Engr. Khalil