Question about Lion Recovery

I downloaded and installed Lion when it became available in the App Store, and my MacBook Pro has been very sluggish ever since. So, I am considering doing a fresh install of the OS and reimporting data, files, settings, etc. from my Time Machine backup. However, things like this scare me a little bit. I don't want to lose any data, so I have a few questions:
- Is it better to use Lion Recovery (Command-R) during start up or to use the Boot Disc of Lion that I burned myself? Or will it not make a difference?
- My choices seem to be:
      - Reinstall a fresh copy of Lion, or
      - Restore your Mac from a Time Machine backup
  Which of these choices is going to be more likely to get rid of the garbage that is slowing down my machine?
- Are there risks of not being able to access my Time Machine backup? I back up to a 1TB Lacie EHD.
I just don't want to get half way into this process and find out that I made a big mistake somewhere and I've lost all my photos or music or something else.
If anyone has any other tips they can give, I'd love to hear them. TIA!

Thanks to all that replied.  I guess I should have been a bit more clear as to why I wanted a clean install.  I'm having a minor software/hardware issue (not sure which although I'm leaning toward the hardware side).
To be very brief, intermittently IF I have the MagSafe plugged in and the lid is closed, upon opening the screen pops up normally for a couple of seconds and then goes black.  If I immediately unplug the MagSafe, the screen pops right back up and then I can replug the MagSafe and get normal charging operation while the computer is on.
If instead, I wait about a minute, the screen pops back up normally (MagSafe left plugged).  I took the computer into an Apple store and they ran all their tests (took over 30 minutes to do so).  The Genius told me the test series showed nothing wrong with my hardware or the OS.
I'm hoping that the problem is some piece of crap ware I have on the computer that is putting it into a sleep mode when this event occurs.
And that's the reason I thought I should try a new installation and in the process, get rid of some crap ware. I'm a curious guy and can't help myself from trying a lot of 3rd party programs that I probably should not be messing around with.  I've had this "illness" for about 25 years now and certainly have screwed up countless Windows installations.

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