i think you should keep it as its not that wise to spend on yaris but if you dont care about the looks of the car, drivefeel only then you can go but if i was at your place i would certainly not as it fails to impress at all. your aspire is also more powerful than yaris its 1.5 right? when i got my grande its reverse cam quality was the most pathetic ive seen in a car although after some updates of the infotainment it got better also the sound quality of speakers was bad compared to my aspire so yaris will also be the same. In my opinion if you want to upgrade then only upgrade with a bigger car like civic or newcity while going for yaris it will be a downgrade regarding looks of both interior, exterior and drive only you will get more features but like i said they are shaskas which have no real use .