well, first of all, welcome!
Secondly, there are answers to each of your questions, I'll try to answer a couple, but some of the answers may not be to your liking.
There are many, many, many excellent models out there- for each versions of SFC. Recently atheoroven went on a spree to convert several ships to SFC1. There are many versions of the 1701 out- origanal through E, and even a few ideas for the F. The 1701 and 1701 A have been done the most- I believe. Recently Khaliban finished an absolutely outstanding version of it- you can find the thread here on this forum just by scrolling through the recent lists. Wicked Zombie has also done several versions- each of them excellent. He's also done the Miranda and variations thereof. Another big name around here is Pneumonic81- who has done just about everything TMP wise. He has several versions of the 1701 and 1701 A, recently did a 1701-B. He has an excellent sovereign, as does Lord Bile.
In short, the models you seek are around, and them some, but getting them lately may be a trick. Many of the greats- cleeve, P81, Knox1711(does kitbashes of P81 and other's, like Admiral), lord delekhan, atrahasis, darkdrone, good god, the list just goes on and on, but many are temporarily out of business due to server difficulties. Apparently finding a good server is next to impossible. This may change shortly, however. In the meantime, i would suggest you check out the new frost works for people like Wicked Zombie, Thu11s and Lord Bile- among others. They should have some great models up there.
http://www.frost-works.com/For your TOS needs:
http://www.strategyplanet.com/sfc/omega/fleetdock13/and one other for good measure:
http://members.fortunecity.com/sfcspacedock/index.htmHappy hunting,
CK