If those are you only two options (and im not sure why they would be your only options) I would go with Aikia. Widex products, however, tend to be very expensive and technology in other products is better.
For example, the Starkey Destiny 1200has the best feedback cancellation system of any hearing aid out on the market (it also has an incredible noise management system).
The GN ReSound Azure is quite possibly the most advanced hearing aid on the market. It features directional microphones on your dominant ear and an omni directional microphone on the other allowing you to hear better in noisy environments. Its noise management system is supurb - great with wind noises and other ambient sounds (like the hum of a refrigerator or air conditioner)
The Starkey Destiny retails for around $3,595. The best price online for the hearing aid is at AidRight.com- $2,199 (and they are running a special on it for $150 off) Here is the link: http://www.aidright.com/Scripts/prodView.asp?idproduct=368
The GN ReSound Azure hearing aid retails for $3,600 and is being sold for $2,599 (again, I think they are running a special on this one for $150, but I am not sure). Here is the link: http://www.aidright.com/Scripts/prodView.asp?idproduct=434
The Aikia and Eleva sell for around $2,400-2,600. So, you could get the Azure (the top of the line hearing aid) for $2,449 or your best bet, the Starkey Destiny (probably the second best hearing aid) for only $2,049 (cheaper and better than both the Aikia and Eleva).
In my practice, the patients I fit with Destiny and Azure products absolutely love them, and most of the time forget they are wearing them. If you must stay with Phonak, take a look at the Unitron Moxi hearing aid (Phonak owns Unitron). That is a wonderful hearing aid as well.
Hope this helps!