First "audiophile" system, now what? Suggestions for best "bang for the buck" upgrade?


After being beguiled with mp3s and the TV AVR, I finally realized I missed having a dedicated stereo system. With a budget of $2400, here is what I put together:
  ProJect Carbon 1 w/TizoAcrylic platter and Ortofon Red cartridge,
  Hagerman Bugle2 preamp,
  Vincent V-60 tube amp,
  Martin Logan 12 speakers.
 No special wires or cables. My room is 14x19 that is open to the kitchen. Compared to what I had been hearing, this system sounds fabulous. But now I want more fabulous. So I am writing to seek help on making short term/long term plans to upgrade. Short term means the biggest improvement in sound that costs $500 or less. The long term plan could cost maybe $2-3k or more. I have read that going from Ortofon Red to Blue might be a an inexpensive but very noticeable improvement? If speakers are my weak link, then maybe Martin Logan electrostatics would be good (when my ship comes in)?
I welcome any suggestions.
128x128etwilley
Wow, I went away for few days and got flooded with advice. Thanks so much. Mostly reinforced what I suspected are best next steps. So here's my plan:
1. Better needle. Swap Ortofon Red for Blue (nude elliptical). The needles use the same cartridge, so the needles can just be swapped. Many folks report that the improvement in sound is very noticeable - for $150 - looks like a bargain to me.
2. Should say better speakers next, but instead I think I may be able to improve the power supply. Much of this I think I can DIY. It may be a modest improvement but may also be a modest expense with free labor.
3. Now better speakers. Problem is the Martin Logan 12s were originally $1500 a pair and I got them new (discontinued) for $400. I'm guessing that I would have to spend upwards of $2500 to get speakers that would sound substantially better, unless they are used and I'm leery of buying used speakers.
4. Better turntable (VPI?) after the novelty of the ProJect 1 Carbon w/acrylic platter wears off. It has issues with motor hum, but it looks cool.
5. High end cables/ wires are last on my list. When my components are better matched, and I have a dedicated listening space that I can customize, maybe then my ears will hear the effect of better cables.
6. I think I will be growing into my amp Vincent V60 for a long time. I think I was lucky to find it for auction on Audiogon. Self biasing 60w tube amp, TAS integrated amp of the year(2010?) for $1200. I think it is the best piece in the system by far.
So the needle upgrade is a forgone conclusion for the most pressing upgrade; what I really need to know is if anyone has experience finding a good speaker match for an integrated tube amp such as the Vincent V60 so that I can start dreaming now? Perhaps this should be a new thread?
Start a new thread regarding the amp and new speakers. List your system and your plan to treat the room.
There are many specifics when matching a tube amp with a set of speakers. A new thread will bring valuable advice.
I believe you have made great purchases on that Vincent amp and the speakers as well. I would be inclined to keep the amp. The question is how your speakers mate with it. This I don't know, however believe it to be what lowrider is alluding to.

I agree (as i posted on another of your threads) that the stylus swap will provide for the greatest upgrade return on investment. 

If room treatment is an option, try some DIY methods. Might want to look up ATC Acoustics, Piper City, Illinois. I have made my own panels with there supplies.