synnyster,
I would not get hung up on the low light fast glass lense for the wedding. Carpents is right. The 50 A 1.4 or the 1.7 is the best for your budget. However, you may not have enough time to practice out all the kinks that go along with fast manual focus/VERY short depth of field at wide aperatures. My wife and I did our first wedding two weekends ago. I've got the SMC A 1.7, and Super Taks 50 f1.4, 105 f2.8, 135 f3.5, and a Suntar 135 f2.8 that take fabulous pictures in low light. "But", my wife shot with the K10 and Tamron 28-75 f2.8 with Sigma EF 500 DG super while I canvased with my K100 with the 18-55 kit and Tamron 70-300 on a tripod during the ceremony (flashless). I use an old Quantarray 9550 (dual light strobe unit) in manual that gives me superb results. Why you ask? We were shooting a wedding and did not have the time or the patience to worry about the perfect focus or about the high ISO noise or about the right lighting. Too many things can go wrong in those situations to ruin the shoot. Our friends as well as clients aren't concerned with the artistic side of dof and natural light. They want the photo's to remember the event. I humbly suggest that the two lenses you own are very sufficient and agree that the flash is the best way to spend your money. A decent tripod for aroungd 70 bucks would help with the 50-200 in low light. Promaster (
Promaster) has come out with a resonably price 2 light strobe that looks just like my Quantarray 9550. If I'd known about it 3 months ago I wouldn't have bought the DG Super.
The beauty af a dual light strobe is that in the reception hall or any room with a light ceiling less than 20ft high you can bounce the head while still getting the forward flash from the secondary.
Great results....... here's two:
This first one is with the Tamron 70-300 from the back row. Slick tripod. My wife fired the flash on her K10 just as my 2 sec timer fired. That resulted in a very cool lighting effect on his face. The others were just as good less highlight.
This second one is at the reception with the dual flash Quantarray. K100 wt 18-55. Not an award winner, but a good example of the dual flash lighting.
As always, I humbly hope this helps.
Chuck