I've been working some events to pay for this expensive hobby when I can. I'm also staffed on my university paper as a dedicated sports shooter. I've been interested in upgrading my T1i/500D to something better. I'd like a better AF system, higher fps, better ergonomics, and a possible increase in high ISO performance as my indoor sports shots are at ISO 6400, f/2, 1/500 sec 
I've narrowed my options down to a 50D or a 7D.
I can upgrade to a 50D for relatively little money. The AF system is better as all points are cross type. Ergonomics are tons better than my T1i and the beefier body is something I want. I would probably be out $100 after I sell my gear and buy a couple CF cards.
The 7D is another option but its far more pricey. I'd love the 19 point AF system for athlete tracking, weather sealing would be nice for outdoor sporting events. I could also sell my ST-E2 since the 7D has a built-in speedlite trigger. I'd be out around $600.
So my question is: Keep my T1i, "upgrade" to a 50D now or 7D later? Is the IQ and AF on the 50D worth the extra money and slight high ISO noise increase (based on reviews)? My main justification for this upgrade is for:
1) Better ergonomics,
2) Better fps. I have a lot of shots where the ball is not close enough to the athlete or just outside of the frame due to shutter lag and bad timing on my end. I'm not spraying and praying, but I think shooting 2+ shots per every shot I can get now will increase my keeper rate.
Just for reference, this is typical indoor sport lighting this season:




