Where do you find a computer supply with a +15V output?Why not use the optocoupler design with feedback regulation, that's used in most of the SMPS. Combined with high wattage and clean supply (Deviation less than 100th of output) that's the best you can ask for.
Just visit any computer shop and pick up a faulty one for a few dollars and replace shorted diodes/FETs and use it in your project.
+5V is for LT1721 and 74AHC08. +15V is for a RF mosfet driver. When Vcc=15V, power supply current of the driver is 10uA.
I plan to buy a 15V 1.2A switch mode PSU. Should be ok?Most non-logic level Mosfets are fully turned on at 10V gate voltage, so a 12V level for the gate should be more than adequate. Since you don't give your Mosfet number or a data sheet link its hard to answer any better.
I think 1A for the whole circuit is enough. Input voltage for the driver is from 9V to 30V. According to the datasheet, the power supply current of the driver is 3mA. LT1721 needs 28mA and SN74AHC08 also does not consume much power.
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