Antec's Sonata series of cases have very poor cooling, although they do look quite nice. If you're looking to get a case with great cooling that includes a terrific power supply then look no further than Antec's SLK-3800. It's basically an SLK-3000b with an included SmartPower 2.0 400w power supply. The 3000b, if you didn't know, is well-respected as a budget-minded case with great, quiet cooling.
I think the two Lian Li cases you'd be considering are the PC-60 plus and the PC-7 Plus. Here's a short rundown of the features of each:
PC-7 Plus
*One 120mm intake fan on the front and one 80mm exhaust fan in the back (although certain sites sell models with a 120mm exhaust fan instead)
*Ventilation slots for an 80mm exhaust fan to be installed up top
*Lightweight but sturdy aluminum construction
*No removable motherboard tray
*120mm blower fan can be purchased seperately and installed over the PCI slots
*Less expensive than PC-60 Plus
PC-60B Plus
*One 120mm fan in the front
*One 80mm intake fan in the back w/ shiny silver duct to guide air over CPU (although it may have to be removed if you have a big CPU heatsink/fan)
*One 80mm exhaust fan installed up top
*Lightweight but sturdy aluminum construction
*120mm blower fan included and installed over the PCI slots
*Removable motherboard tray
*More expensive than PC-7 Plus
Cooler Master's Centurion cases are very popular among people looking to get a decent case for a great price. You really can't say a whole lot of bad things about it, especially given its price range, but conversely you can't give it as much credit as you could with a Li-Li or P180. Lian-Li cases are all extremely lightweight and have good cooling, so they could be easily used for a LAN case. A P180 would no doubt have more cooling potential and special features than either a Lian-Li or a Centurion but it is quite heavy. But then again, if you're like me and you work out on a regular basis you can use a P180 for a LAN case too. Imagine that...I'm using my P180 as a LAN case!