I recommend you get the Canon 50mm f/1.4 just to start and have some fun with. Hardly a large investment in comparison to the rest of the things you're considering, and it will open some new doors, and will stick with you on your migration to full-frame. On your 60D, it will make for a nice medium-tight portrait lens. When you finally switch to full-frame, the field of view of the 50mm lens will be much wider, making it a good lens for full body portraits.
You can play around with the low-light capabilities of that lens, and with the shallow depth of field it produces. At any rate it will make you want to play around more with your camera, and that's one of the other big things next to gear that will give you greater pictures. I personally just upgraded to a 60D with some better lenses (coming from a 350D with kitlens), and it put a lot of the fun and experimentation back into photography for me. From what I know now, I could have taken 50% of my new pictures with my old gear just as well (yes, only 50%, because I also shot at higher ISO's a lot - impossible with my old gear) - but primarily, my new quality stuff inspired
me to do more with what I got. Including post-processing, which I hardly did before as well. Now, having played around a lot with Lightroom (3), it's just amazing what I can do with the camera and it's a joy to try and make the best out of the pictures I take. I've been going through old pictures with Lightroom as well and I was able to enhance or even 'rescue' several pictures that are now among my all-time favorites.
I included some example shots. They're more examples of what Lightroom and the new drive to CREATE stuff did for me, than what my new camera did for me. Although the new camera has been the catalyst for this new drive. In my case, "just" a 60D
First picture was with my new 60D, with only cropping and minor colour tweaks in Lightroom.
Second picture is from my old 350D, but with recent minor lightroom colour tweeks.
Third picture was taken with the new 60D again, but with strong backlight and slightly underexposed on the subject - which turned out to be good because I was able to recover those details while maintaining the most important part of the highlights.
The last picture is a "work in progress". It was a JPG shot with my old camera, auto metering, but by accident taken at -1 stop exposure compensation - ánd in strong back-light - causing it to be severely underexposed. The JPG accordingly also messed up the colours, and it's not as easy to fix as RAW files. I keep coming back to this picture because I leave it when I'm satisfied after some editing, but then when I come back to it after looking at other pictures, I'm dissatisfied again. It keeps coming out too dark or the colours somehow "unnatural"-looking. It will probably further improve, hopefully to the point that I'll be satisfied with it even after coming back to it later.