I just got done looking at your gallary. Looks like you enjoy a lot of macro. Any suggestions on macro lenses?
I'm not really a fan of macro ...this is the only lens I own. ROFL
Yes... I am a macro nut case. I like to shoot other things as well but... the macro world has me hooked.
A few questions to ask yourself...
Shooting style /goals
Weight of the lens and camera shake...
I've used the Canon 100mm the past 4 years. As with 99% of macro lenses from all brands... it is wicked sharp!!! It isn't very heavy...even though it has a lot of glass in it. The working distance in very nice. You can add extension tubes to increase your magnification. Even though the manual says you can't use a teleconverter with the lens you can attach an extension tube to the TC and then attach the lens.
If you shoot hand-held.. .this is a great lens for the job. The weight won't beat you down.
The reason I mention shooting style/goals... you can take close up shots that look great with most any lens without the need for a true macro lens. If you really want to see all the amazing details...then a 1:1 macro lens is the way to go IMO.
I think the Canon 100mm is around $400 or so. It can be used for other types of photography... just know if you photograph people with it.. .all the details show... the good and the bad.
I wanted a little more working distance and great bokeh the 180mm macro lenses produce. So... I bought the Sigma 180mm macro. I was nervous as I haven't purchased anything other than Canon. I'm so glad I bought the lens and saved some money. It is performing very well. I love the bokeh in the shots. The extra working distance is nice. It is harder to shoot than the 100mm due to the focal length... the weight isn't bad but you notice a difference. I would suggest a monopod or tripod. I've used the monopod with it several times... very handy!
The Sigma 105mm lens is supposed to be excellent as well as the Sigma 150mm.
For an all around/general purpose macro lens... you just can't beat the Canon 100mm macro IMO.
Hope this helps.