Each to his/her own.
I have a 2010 27-inch iMac. It was too slow. So I put in a 500GB SSD (This one:
http://uk.crucial.com/gbr/en/ct500mx500ssd1 ) and upgraded the processor to i7 (bought second hand on eBay) and whacked up the memory to 12GB and it's still perfectly good for routine use, despite being 8 years old now.
It was worth it because the 27-inch iMac has a lovely screen
Personally, I probably wouldn't upgrade the Packard Bell,due to the limited RAM, but there is no doubt it will start up much quicker and should be more responsive with an SSD.