I'm also a 34B and I've tried a lot of different brands. My personal favourites are the Moving Comfort bras, specifically the Phoebe model - I've got two of those and have run a marathon in each with only one small patch of chafing at the centre back (which was absolutely fine on my 20 milers go figure).
I'm more annoyed about the fact that there's no bag check. For a race where you get covered in paint, it's a bit rich you can't bring a change of clothes. The organisers suggest you carry the provided poncho with you as you run so that you don't get paint on public transport on the way home.
Oh, and there's no medal, either.
This race had better freaking be as happy as advertised, or I'm going to be seriously pissed off at what a rip-off it is.
I ran Copenhagen marathon a few weeks ago and my parents in the States got up at 3am to track me, across three devices:
1. The official marathon app, which showed my progress every 5km, as well as expected finish time and position amoungst my other club runners (the website also did this)
2. I use the Runmeter GPS app, which posts my progress every 5min to Twitter and Dailymile (and to FB, but I don't use that). The cool thing is that anyone can reply to the status during my race and those comments are spoken into my ear as I run. I must've had 50+ comments, from as far flung as the States and Australia.
3. The official website had a live video stream, so as everyone could see me passing the 40km mark on the app & Runmeter, they switched over to watching for me crossing the finish line.
While only two of these were down to the race organisers, this was BY FAR the best tracking I've seen for a race, and crucially, it all worked perfectly on race day (unlike my experience with apps for the Royal Parks Half, which look great but grind to an unusable halt on the day itself!).