Which TT the Pro-Ject RM-5 SE or Rega P3-24?

Point taken. And nice to here that cautionary note in a world designed to make you want to spend more and more.

This whole thing started with me wanting to upgrade the cartridge and the platter. Plus I was going to get the speed box because everyone says that it helped with pitch stability, and I have already detected this problem with the debut III. Then I realized that it was going to turn into an $800 table after the upgrade, and that's when I thought that what I was looking for was something at that price point.

I have no intentions of becoming an "upgrader" though. I actually hate that aspect of this music equipment thing. I am thinking of the Rega, etc., as a very long term investment (albeit a modest one by audiophile-magazine-standards).

Are you guys saying that my enjoyment of the music might actually decrease with the Rega or the better Pro-Ject?

Only you can decide which is better. If I were choosing between the Pro-Ject and Rega it would be the latter. However, if you like the current performance of your table the upgrades should only make it better.

Tvad, It appears you are contradicting yourself, regarding upgrading that is. There's nothing wrong with stock Rega tonearms, and for that matter, Rega doesn't "encourage" anyone to upgrade.

First paragraph says, "The problem I have with Rega stems from their business model, which seems to encourage constant upgrades: platter, speed control, arm. It never ends."

Second paragraph says,
"If you want exact speed in a time tested table/arm design, then buy a Technics. Later. add a couple KAB upgrades, and for under $1000 you're done. Or, watch for a used version to surface with the KAB upgrades already installed."

So upgrading the Technics is o.k., but not so with Rega??? This is not a personal attack on you BTW. I'm just confused by your post.