The founding generation of a Dynasty is the one with the biggest financial hurdle, but luckily it's also the one with the greatest amount of latitude with moving people in. And moving an extra person into the household helps a lot: not only do you get two initial boosts to your coffers, but you have 3 people who can work careers or skill related professions to keep the money flowing in. It's something that I would recommend that anyone starting a new dynasty at least consider.
I'm not a member of the Agnes Fan Club. I don't find her physically appealing even with a makeover. However, she is rich and has a very high painting skill when the game starts, so she is at least worth bringing into the household for those reasons alone. But even though I don't think she's all that good looking, even I have to admit that she is capable of producing some very good looking children. So she's not a terrible choice for the founder's wife, either.
But if you're looking to bring someone really attractive into the household as "first lady," I would suggest Jamie Jolina. She's attractive, and starts out rather high in the medical career. Her daily paycheck is significant from day one. Emma Hatch is likewise gorgeous after a few hours on the treadmill and a serious style rework, is a Natural Cook and starts out in the culinary career, giving you a good shot at getting that fridge early on. Claire Ursine is not a bad choice as far as looks go (after the same attention Emma Hatch needs), but it's likely that she'll parallel your founder's career and already has a child on the way, so it's likely a two for one deal with her. Pauline Wan is another good choice, and if you can wait 3 days on the spouse, so is Bebe Hart.