I am looking at getting a beefier card than my 030/25, but I am concerned about heat.
Reading a bit, it seems that 040 and 060 cards will cause heat issues in a normal A1200 case, is this correct?
What about an 030/50 ?
Basically, whats the beefiest option for a non-towered plain old A1200 case ?
030/50 is your best bet, if you get a Blizzard it's also easy to move all your ROM libs to FASTRAM for a nice speed boost using the excellent BlizKick utility. That said you're not going to to able to do much more with an 030/50 over an 030/25.
The only other real option IMHO is an 060 (040's are too hot). There are a few issues with running 060's in a desktop case though (as I found out to my own cost). For a start you have to get one with a flat angled SIM socket which can only take single sided SIMS, you are then restricted in how much you can overclock it and you also need to consider the crappyness of the standard PSU which might not be up to the task.