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Let me answer your question even though I have no idea what you trying to ask....

1) is Nikon D7100 worth to buy?
Yes, Nikon specially designed its 24 magapixel DX-format CMOS sensor, high speed shooting with flawless metering and autofocus, 6 frame per second continuously and use 51 focus points, perfect camera for people who can't afford those high-end like D800.

2)which lens is most suitable?
Well, it depend what are you gonna shoot, different lens for different purpose, it also depend on your budget too, if you want to use 1 lens for everything then I suggest you to get Nikon 18-300mm f/3.5, it cover it all.