rb25 info needed

[s13rookie]

i am almost ready to get my car going. i have been planning for months to go turbo KA.  but i am wondering how hard, more importantly(HOW MUCH) the swap would be to throw in a rb25 engine.  i figured id be spending close to 2500-3500, to turbo the ka while pushing about 210-230 to the wheels, until i rebuild the car over the winter.  i know the engine isnt cheap, but im wondering if the install is comparable to the sr in terms of effort. i know the rb has way more potential than the ka.  basically, im running on a budget of about 8g, im trying to get the fastest car i can for that money, minus about 2g for suspension, wheels.    if any one knows, insight would be greatly appreciated, thanks a lot, matt