I was referring to Snow Leopard but only when he buys a new machine , I wasn't expecting his PB to run Snow Leopard, but by the time SL does come out in a year or so his existing 'updated' (with 2Gb & fresh install ) Powerbook will be tired .
For the OP's uses there is no point (imo) getting a new machine until absolutely necessary .
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What I'm saying is this :
OP ... keep the Powerbook , upgrade the RAM , stay on 10.3 until Snow Leopard comes out , then buy a new Intel Mac with Snow Leopard on it .
🙂This is what I would do if I used a machine the way the OP has said