I personally don't like mono decks because of some clan problems... An example is that Ulu Watu usually has really low damage and is prone to SOA while Junkz usually lack and damage and is also affected by SOA...
If you like Junkz and Ulu Watu so much, maybe you can mix them... I personally think Bree and Buck are not necessary, but here's my outline...
Rowdy - 4
Gibson - 4
Veenyle - 2
Lolly / Onik - 3
I would only prefer Onik because of his ability and 8 power to make it necessary in most occasions for your opponent to have to use 2 more Pillz...
Lulabee - 5
Nanook - 3
Gaia - 3 / Gaia - 2
Warren - *1 / Gabrielle - 2
Lacks SOA and is mostly offensive, enjoy!
Hikiyousan is good, but as 0 whitefang suggested, Lulabee is a very strong alternative, and a lot of people prefer her.
I like Junkz, and with the 3 4stars, 2 2stars, and 3 3stars, you've got a good spread, fewer bad hands that way.