No, Pro Tools LE isn't Pro Tools HD. It's still Pro Tools. You can still take your session data from one and move it to the other. I believe that once you work in Logic Studio, you can't open the session again under Express.
Sure, you're limited to Digidesign interfaces for LE, and M-Audio interfaces for M-Powered.. but you can use the same interfaces for any software DAW that you want. But you already knew the answer to that and are just trying to continue an argument.
Like I said before, I used to be a Mac and PC technician. I've owned more Macs than you have over the years. I've been a PC and Mac beta tester for audio software companies, and currently make my living building systems for videographers and musicians/studios. A Mac is just an overpriced PC. I've used Cubase (VST/5 through SX 5), Cakewalk (PA 9 - Sonar 8), Pro Tools (6.1 - 8.0), Logic (6.0 - 8.0, haven't tried 9 yet) Logic Express 7 and 8, Acid 4.0-7.0, every version of Vegas and Sound Forge, Reaper, and maybe even more... and I feel comfortable enough making recommendations for people looking to get into recording.
Would I recommend Logic Studio? Possibly, if the person already had a Mac, but I'd recommend Pro Tools as well if they're wanting to take their work to a studio. If they wanted to do everything themselves, Logic Studio would work fine. Would I recommend Logic Express? Only if I felt that they were just looking at hobbyist level production.
Personally, I think the best setup on the PC right now is a combination of Reaper and Pro Tools, at least until Pro Tools is 64 bit.
99% of people that say "forget that, buy a mac" are fanboys. I'm sorry that a PC didn't work out for you, but it's a computer, not a movement.