In my opinion, GeminiJets are very acurate and realistic, and are of superb quality. They are my favorite model manufacturer in the 1:400 scale, but there are several others out there that are just as good as Gemini, and in some cases better. They all have registration numbers, and all regular releases from Gemini are limited to 2,000, which gives them a collectable value too. But of course, thats not why I collect them. Also, there is a HUGE selection to choose from from Gemini, and they usually release about 7 or so models per month. So have fun with the hobby, collect what you like, and remember, you dont have to stick with 1 model company. Some other good ones are DragonWings, AeroClassics, Herpa, and Jet-X, as Runway25 mentioned.
BTW, if you want rolling wheels, go for 1:200 scale. I collect 1:200 and 1:400, and love the 1:200's. They just take up so much space, and it's hard to build a large collection.
Good Luck, and I hope this helps.