In these spots I always get doubts. Against a maniac or a very agressive reg I might shove for value. Althought against a very agressive reg I must take into consideration that Im opening UTG so he would perceive me as strong and probably wouldn't x/r this board as a bluff...

What about against an unknown?

Text results appended to pokerstove.txt 

39,600  games  0.001 secs  39,600,000  games/sec

Board: Jc 8c Ts

Dead:    

                   equity        win             tie           pots won    pots tied  

Hand 0:    44.258%    43.62%    00.64%     17273     253.00  { KdKs }

Hand 1:    55.742%    55.10%    00.64%     21821     253.00  { JJ-TT, 88, AcQc, AJs, AcTc, Ac9c, Ac7c, Ac6c, Ac5c, Ac4c, Ac3c, Ac2c, KcQc, KcTc, Kc9c, QcTc, Q9s, JTs, AJo }