Melvin Taft once produced the ugliest female sim I've ever seen, he's hiding a hideous chin under that beard so unless you want that ruling the town I'd avoid him.
Henry is good though and he has some fishing skill, I've noticed in general Bennie dies first of the three grandpas, normally it's him, Ma bagley and Rayna Kaminski who are the first to go, order switches between them but I reckon they must be the oldest elders in town. Henry usually lasts a fair while so plenty of time for pollination.
Jebediah is also a good choice for genetics, give him less receding hair and he's pretty cute, he is a bit boring though in the personality department, an ambitious workaholic so maybe wont be great at wooing the ladies, I had a gold digger sim marry him a long time ago and he was just so dull I was glad when he died.
Lucky Perkins is easily impressed so likes to compliment the ladies quite a bit, he's not too bad looking aged down so might produce good babies. He can also cook a bit and has some fishing skill.
Jon Lessen is another good choice, he has the artistic trait, is a hopeless romantic, has a margaret vaguester, and is almost an elder.
I agree with Trip about Billy, I'll admit though he ended up in my life states dynasty mainly due to his occult status and the fact he kept kissing my heir, but he does love to paint, don't give him a computer though or he will waste hours posting inappropriate forum posts. And he makes good looking kids, so he would be a decent pollinator/painter.
As for spouses that depends on your time frame a little, there's lots of teen boys in town, some with great traits for an immortal dynasty such as Maximus McDermott with angler and Bob Newbie with artistic, and they both age up saturday of week two, in fact all the first batch of teens will be YA by then. It really depends on how soon you want to start a family, Sherman Bagley is also a decent choice, he's just a nice guy, good looking and his LTW is dynamic DNA profiler so he would need to learn painting for that.
And as has been mentioned George Dean, he's a closet pyromaniac who might just have killed his own mother, but other than that he's great, you might even end up with pyromaniac kids as hidden traits can get passed down.
Of course not sure my opinion of spouses is that great as I always marry into the evil family