G'day all 
I am looking at grabbing a couple of lenses to either replace some I have or to bulk out and complete my lens collection for now.
I purchased a Canon 550D with a kit lens and also came with a Canon EF 50mm f1.8 II and a Canon EF 75-300mm f4-5.6 USM III.
I was thinking of purchasing
Are these lenses fit for the purposes mentioned above, and are they any good? I dont have a massive budget but could just about afford these 3.
Or are there other lenses that might do better than these within the same range?
Thanks for any assistance
G

I am looking at grabbing a couple of lenses to either replace some I have or to bulk out and complete my lens collection for now.
I purchased a Canon 550D with a kit lens and also came with a Canon EF 50mm f1.8 II and a Canon EF 75-300mm f4-5.6 USM III.
I was thinking of purchasing
- Sigma 105 mm f2.8 EX DG OS HSM MACRO (as quiet interested in Macro and this lens seems to be a good one)
- Sigma 8-16mm f4.5-5.6 DC HSM (I drive through the Moorlands twice a day and thought this might be good for landscapes
- Sigma 70-200mm f/2.8 EX DG OS HSM
Are these lenses fit for the purposes mentioned above, and are they any good? I dont have a massive budget but could just about afford these 3.
Or are there other lenses that might do better than these within the same range?
Thanks for any assistance
G