Don't worry about them getting too big -- as you burn fat they'll get smaller but toned.
! Let me know if I can help further.
)! Because my knees are bad, we got an elliptical and the whole family uses it. It's a NordicTrak model and I believe it cost over $500. That Orbitrak one sounds like a good deal. Most good ones that I've seen out there are around $500 or so. They have a good one in the gym (I think it's ProForm) with an incline...mine lacks that but mine has the handles that move so you get a good upper body workout as well. The gym one doesn't. The salesman told me the home models have the handles that move and the gym models don't. From what I've seen, it seems to be true. Keep on ellipticizing! 
) I have used a couple other "lower" level models. One was at a gym while we visiting family, the other at a niece's house. Both were okay to use, but in both I found that the whole unit was narrower so that you had to be very careful that you don't get whapped by the handles if you're not using them. My feeling is that these lower level models wouldn't hold up as well to the heavy use of a gym, but are fine for home where only one or two people are using them. They are way quieter than a treadmill too.
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My problem with having any of these machines is that I live in a VERY small house, and it's full!
I'd love even more to have a piano instead of an electronic keyboard, but same problem, no room. Oh well, at least the gym is close, and nothing else screams out to be done instead - nor are there cats begging to be noticed.