Irritrol's a good choice.
Here's what I'd go with.
Both are very reliable.
Irritrol 2500
and
Irritrol 205
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The 205 is what you have now. It's been around a long time and is very reliable.
The 2500 is also reliable and also easy to rebuild.
With the 2500 you can turn the valve on manually without using the bleeder screw.
You can't go wrong with either valve.