I've seen their website, but know nothing of them.
Some of their breeder cats look quite nice, as do the kittens; a few look a bit too Bengal for my taste, but only my opinion....what about this breeder made you ask for opinions here ?
If this breeder has a kitten that catches your eye, makes your heart skip a beat when you see his/her pics, and you feel is just the right one for you....then go for it, as long as the kitten is healthy, well-socialized, comes with a contract with health guarantee, and you feel comfortable with the breeder. A good breeder should be willing to answer any question you ask AND be willing to be accessible to you for as long as possible. References from past kitten customers is a big plus, too.
I have to agree, that's a lot of problems coming out of one cattery so I understand your hesitation. Has the breeder screened her breeding cats for HCM since you notified her of Servo's diagnosis? It sounds like she is still using the cats, even after knowing that Servo died of HCM, or am I misunderstanding?
As for the other breeder, it seems she is not well known in the community, but that doesn't make her a bad breeder. Talk to her, ask her questions, ask to see her contract. Ask her what she wants to know about you (a reputable breeder will screen potential customers, and many have pre-adoption questionnaires they require to be filled out), ask her if her kittens have had any health problems in the past, and ask her for references.
Don't jump into something into purchasing a kitten just because it's available and at the right price, but if you feel that connection with it after seeing the pics, then go for it.
Well, screening can be subtle too - for instance, when Cary emailed me about a kitten he gave me so much information about himself that I knew without asking a single question that he would be the best pet owner I could ever wish for - most are not that easy though, and some get offended by all the questions.