http://cpuboss.com/cpus/Intel-Core-i5-4460-vs-Intel-Core-i3-4130Link above shows the performance difference and the difference is pretty significant between them. From the system that your upgrading from the Core i3 is likely way faster. I feel it would be an easier choice for you if they were both Core i3's or both Core i5's, but the Acer is more powerful solely because of the Core i5 processor.
It still kind of comes down to if your willing to gamble with low quality parts and maximum speed or good quality parts and less processing performance.
With the Acer if you have a failure with it that is outside of warranty terms your most likely looking at a $50 power supply if you install it yourself or a $60-$100 motherboard to replace a blown board. The CPU and RAM would probably move over to a replacement board without any troubles.
So if your willing to gamble and able to fix the computer troubles on your own then the Acer is a valid choice. However if the computer would have to go to a computer shop and get repaired your cost of repair can easily exceed the worth of the computer. For motherboard replacements and full rebuilds if using a different motherboard than original, it usually costs the clients around $120 in labor + parts so if the board was $100, then its $220 to fix a $500 computer. Power supply replacements are generally $40 for 1 hour labor + parts cost such as a $50 power supply so for $90 they have their computer back.
NOTE: This is
NOT to advertise or solicit my services, its just to give you an idea of what it may cost if you had to have someone service the computer outside of warranty. Also while I charge $40 an hour, I have seen some computer repair shops charge as much as $90 an hour. But because I dont have any overhead there is no need to rip people off and so $40 is honest and my clients are happy with that.