UlfSeele wrote:So dog-pile me with advise and suggestions as suits your fervor.
I eagerly and patiently await your help.

first and foremost, plugging the exit hole of the toy with your finger increases the suction, and is my preferred method of toy play.
Natascha is an older design, if you contact support you can put a split lip on her to add some extra taste, I love my natascha especially because of it. Natascha is smooth, but if you're more sensitive, you should be able to feel the flesh textures quite easily, in addition, her lips need some prying open before penetration.
Lily sadly cannot have split lips, but she's otherwise quite fun if you want one that's textured but not overwhelming.
the dragoness muzzle I know little about, except that she has ridges like Janine does, and Janine has the most pronounced ridges of them all. if you're sensitive, you'll be overwhelmed in a flash.
your choices however, are all tear hazards, and if you're budget-impaired, you should either stick with the highly-ridged Janine, the super-smooth anthro shark, or the monkey in the middle that is mary.
(I presume that you're like me and only interested in female-based toys.
)if money is no object, get all three of them!

either way, for your penetrables, you should get sil-poxy. if it's not available in your country, get an adhesive that works with platinum cure silicone, and be sure it's stretchy upon curing. it costs under $40 on amazon, although some places might be comparable.