What would be a good Macro lens especially for Flower photography?

I was thinking of a 60 mm Macro Lens. But than again, I'm more into flower than bugs, but if I want to do macro photography of bugs, should I get a 105 mm Macro Lens so that I won't have to be so close to the critters? Thanks. And I have a Nikon Camera if you have a good Macro lens to recommend

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Would this one be good?

Now each will prefer a different lens. I'm using a Nikon F for your kind of work I would use bellows and right now I'm using a Macro 80 to 200mm Makinon Lens so I can be a few feet away get on under side of Spider and show the bellly of a black widow spider.

And the same thinking is applied to ANYTHING your taking pics of when close up. Not because them horrible creepy lil bugs may jump and get on you or make nasty faces at you as your looking at them, but longer macro lenses allow you the ability to - not be in your own light!
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There are times when using my 60mm macro that I can actually be in my own way. There's now no room for the light, the natural light, I wanted to use. I love my 60 but I love my 120 medical macro even more.
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If I were to buy another macro, why I have no idea, but if I were I would go for the 105 just for the working distance from lens to subject.
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Extension tubes and bellows on longer lenses make for excellent close up lenses as well and depending on the focal length of the lens your using you can be feet away but still getting a postage stamp size field of view.

Well a Nikon f1.4 would be good and if you can get a ring a round for your Nikon you can mount a Sigma f1.4, it has great Bokeh! But they are both 50mm

The 60mm micro lens you linked to would be perfect for flowers, but short for insects. If you want to shoot bugs, then a 105mm macro lens would work better.

I shoot Nikon and I shoot macro occasionally. The best lens I would recommend is the Nikon 105mm f/2.8G IF VR.

Remember to turn off the VR when you're using a tripod, and VR should not be a crutch to replace a tripod. But for hand held shots in bright lighting, VR gives you an extra 3 stops before needing a tripod.

The photo I listed in the credits I took with a Nikon D300 and the 105mm f/2.8 mentioned above. Believe me when I say, 2.8 will be fast enough when doing macro. When you look at that photo, below it click on the 'details' tab, it gives all the info. Notice the shallow depth of field, that's at f/9.