If your logic board is working I would look at first maxing out the RAM and then upgrading the drive to either a SSHD or SSD
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If your logic board is working I would look at first maxing out the RAM to 3.0 GB and then upgrading the drive to either a SSHD or SSD. The one thing you do need to be careful is making sure the drive you go with runs at SATA I (1.5 Gb/s). As an example:
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* Seagate FireCuda SSHD
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* Samsung 860 EVO SSD
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Both of these drives support SATA I (1.5 Gb/s) make sure whatever drive you get lists it on the spec sheet like these. If it doesn’t its not able to work reliably in your system.