Good idea to replace most of the components?
I'm planning to buy an old unit with what I believe has the 1.83 Core Duo processor. I'm pretty sure the hard drive is toast. It will not load the OS, I can't reinstall the OS, verify, fix, partition or ect the hard drive. (I don't remember exactly what the error stated) I don't think it's a board issue, I'm obviously here though as I don't know everything. The battery also doesn't charge/the unit won't stay on without wall power. I don't see that happening only because the OS isn't installed... but see above comment on not knowing everything. It also only has 1GB of Ram, so I'd up that to 2GB.
Obviously, I'm looking at a fair amount of what I'd consider non difficult repairs. Maybe a new unit would make more sense, but I'm really wanting to tackle this and feel good about the accomplishment. As long as I'm not missing anything, replacing the RAM, HD and battery is what I'll intend to do to get it working for my needs. The main question I have then is on the HD. I've looked around different sites and found many different reports on what I can use. Some say 120GB is the max, others say nothing above 250GB... and here says 500GB will work fine. Obviously not a huge price difference with whatever I'd choose, and bigger is better, but I don't want to buy something that won't work.
Any ideas, thoughts and experiences would greatly help.