Diskwarrior or Techtools Pro? Dock/Memory problem

This is actually about three questions in one - apologies. But they seem related. So: I've been having problems with my dock freezing on startup. I've serached these threads, but my dock freeze refuses to be cured by any solutions suggested elsewhere. Similar cause though - the problem began when I upgraded to Tiger from Panther - I'm running 10.4.3.
I've run disk utility, repaired permissions, run Cocktail and all have reported that whatever minor hard drive errors they've found have been repaired.
I've been told that I should invest in a third party disk utility and repair system - Diskwarrior or Techtools Pro 4. But which one? Techtools sounds a bit like the old Nortons Utilities - which I gave up on when I bought this G5 as everyone I spoke to said it was a bad idea to run it.
Finally, as my Dock freezing problem persisted, I ran a hardware test to see if there was anything wrong with anything else. 'Mass storage' passed, 'Logic board' passed, but it seems I have a 'memory error detected'. Do I have dodgy RAM and if so, should I replace it? Is this the cause of my dock problems?
Any advice as to how I should proceed gratefully accepted.

I backed up all my really important data onto DVDs and a few other bits onto my iPod. But I see the wisdom of what you say about an external hard drive not being affected by a sudden power failure - I'll purchase one. Good advice, thank you.
I'm wondering if the dock problem is not something completely separate; perhaps to do with a recent upgrade to Tiger from Panther (although I was careful to follow all the recommended routes for doing this).
Meantime, I'll try removing the offending memory board later today when I have a minute and see what happens. I'll keep you posted!

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