Bear in mind, there's different Wildfires. The original is widely regarded as pants and is like three years old now; the Wildfire S is better, but I don't think it's ever been particularly desirable over alternatives.
I've not looked at them in a while, but Orange usually have an own-branded budget Android phone in their line-up which is well regarded, previous ones have been called "San Francisco" and "Monte Carlo"; I'd expect then to to be doing something similar still.
If it's just a stopgap, I'd suggest exploring the second-hand market. I can't think of many compelling reasons to buy an entry-level handset from new.
Your question about updates is handset-specific, as OS updates require either the manufacturer or the modding community to release new firmware for that device.