I currently own 3 of the 4 Hoyts you mentioned,I'll list myfavorites if money isnt an issue but you know the old saying, only you can determine what the best bow is, you have to hold it, draw and shoot it to make a logical rational decision, if you cant, then I hope these posts help.
1) Tyrkon
2) Vipertec
3) Utec
4) Havotec

If moneyIS an issue then heres my recomendation
Havotec

Trykon is an incredible performing bow, fast, quiet, forgiving and all the latest Hoyt technology and goodies but your going to pay for all that, well worth it IMO.
However, the Havotec is a few years old and can be bought very cheap on Ebay etc ... I loved the Havotec, great bang for the buck especially now that its a few years old.
Vipertec, well its an incredible shooting bow especially out of a stand, best bow Ive ever killed deer with, hopefully the Trykon will be my fav hunting bow after I harvest a few deer with it but as of now I cant put it in that category. They are all good bows honestly, good luck