Better graphics required...
It's ridiculous that Apple doesn't offer a real upgradable mid-range tower option.
Not really when you think about it. A mid-range tower, that allowed you to upgrade graphics and RAM, would simply be a cheaper version of the MacPro and would seriously cut into the sales of the Pro line.
Why would a professional shop buy a Mac Pro for each employee when they could buy Mac Towers for half the price and then use X-Grid to share spare processing cycles (you're not always in the middle of a large render).
<rant>
What I would like to see however is the Mac Mini given a beefed up graphics processor like they used to have. Right now I have an older G4 Mac Mini that came with a Radeon 9200, in upper mid-range at the time, that worked great for whatever I threw at it. Unfortunately it's getting a bit slow for some of the things I want to do, so I've been wanting to get a new Mac. With the dreadful Intel Integrated Graphics, the new Mac Mini wasn't even on my radar. I do like to play the odd game in between editing videos of my four year old niece riding her bike!

Yet I don't need a kick ass machine like the Mac Pro.
"So why don't you just go buy and iMac?" I find the iMacs to be extremely environmentally unfriendly and needlessly expensive. An iMac is basically a Mac Mini with a built in display. They even use the same laptop components and have similar specs (look at the low end iMac).
When you really think about it, your monitor will last far longer than the computer will. I have 15 year old CRT monitors that still work! Yet because the monitor on the iMac is built in, it forces you to take a piece of perfectly functioning equipment and throw it away because the iMac doesn't let you upgrade the computer without buying a brand new monitor along with it.
I simply don't see why I need to throw out my excellent NEC 200VX 20" 1600 x 1200 LCD display used with my current Mac Mini just to because I want to buy a new computer.
What the Mini needs is a beefier graphics card so I can throw some of the latest games at it without having to pay 3,000+, or throw away a perfectly good monitor, to get there. The funny thing is that better graphics in the Mini still
wouldn't impact the Mac Pro line because the specs on a Mac Mini, even with the beefier graphics, wouldn't be anywhere close to the Mac Pro.
Hell, they could have three SKUs if they wanted to. The cheap one, using the Intel Graphics, the mid range using the new Nvidia 9400M, and a high end one using the new Nvidia 9600M. Make the FW400 a BTO option, in case they're thinking of removing it (stupid idea if they do, the Mini is a desktop without lots of storage, I don't know anyone who owns one that doesn't have at least one FW400 external drive hooked up to it).
If Apple gave me a Mini with a beefed up graphics card, even if none of the other specs don't change, I'd go into debt to get one opening day!
</rant>