Lens options for wildlife and Macro

[hrishi]

I will be returning the Super Takumar 50/4 macro to its owner and hence will be back to the 18-55mm and k300/4 ..I'm searching for different lens options. I need
1. light, AF, tele zoom lens to complement my kit lens
2. macro lens.

The Tamron 70-300/4-5.6 Di LD gives a 1:2 macro (same as that 50/4 macro) and gives a greater working distance too. Agreed that the IQ will be sigificantly lower than a dedicated macro lens and a super tele, but it is so light that I can carry it everyday to the university too..It complements my kit lens perfectly..Choice before me-

1. Buy the 70-300 now and then buy a 300/2.8 (or a 500/4.5) and a 180/3.5 (or a 150/2.8) macro later (1-2 years).
2. Buy sigma 50-500 now and live without a macro for a year and then buy 150/2.8( or 180/3.5) later.

I don't want to upgrade any lens I buy. I know very well that if I buy a 50-500 now, I'll want to upgrade it very soon..

I wish to have two kits- a lighter one useful for travel photography and a heavier one for dedicated nature photorgaphy.
light weight kit - 18-55 + 70-300 + 50/1.4..(it will cover 18-300mm and give a 1:2 macro and serve well in low light)
Dedicated kit- 12-24+ 50/1.4 + 150/2.8 + 300/2.8 (or 500/4.5)..


All comments/suggestions are appreciated.

Hrishi

[k100d]

if you're on a budget, need the macro and the tele, the tamron is a great deal
with either the tamron or the bigma, you'll most likely be constantly thinking of better options in the future