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Unfortunately PSoC creator does not suggest which chip to use. But there are tools inside the PSoC Creator which can be helpful for you.
The first one will be the resource meter. This shows how much resources are used by your project. This will help you to see whether the device you are currently using is ideal for your application.
The second one will be the device selector window.To select this right click on your project on workspace explorer and select device selector. As you are interested in PSoC3 family, select the PSoC 3 in the family filter. It lists the devices with the resources available. So if you know how much resource you need, you can easily select the device which meets your requirement.
I hope this helps.