I think some of the discussion about the Tufos should also consider where you're racing. If you're in New England or Mid-Atlantic the Challenges are your best bet for cost effective tires that perform well. If you're out west in CO or CA in dry conditions, a Tufo will be a better choice since some of the rocks and desert debris can shred the supple cotton sidewalls of a Challenge or even the Dugasts.
I would agree with Katsu that the Flexus line up of tires should be your racing tire choice. If you have a training set of tubulars for your weekly races the Elites will be fine as they are not as supple, but last longer.
I'm in mid-atlantic, run Grifo's in both 32 and 34c, and Fango's in 34c. I've used Tufo Elites in 34c in the past. If I were to choose 1 set of tires for this region, I'd go with the Fango's in 32, unless you're a big boy (I'm not at 150lbs), then I'd go with 34c. The Fango's are at least as fast as Grifo's in dry conditions, better in wet grass, and better traction in mud. But only shades of difference, and if you look around you can probably find better closeout deals on the Grifos (or Gommitalia magnum equivalents) if you're on a tight budget. Perfect for all but 1-2 races this year where deep mud would make a dedicated mud tire like the Rhino a little better, but the frequency of those conditions isn't worth the expense if you're trying to keep it cheap and simple. I can't think of any Mid-Atlantic races where I might have preferred a file tread.
I have been running the TUFO Flexus Primus for most races all season and it rocks. I used the TUFO Flexus Cubus for muddy events and was hooking up very well, with little mud build up. The bad thing with some of the cotton sidewall tubulars is that you need to coat them with aquaseal or they will rot on you. The TUFO's are a mount it and forget it tire. Good luck with whatever you choose and although you didn't ask about glue, I recommend Vittoria Mastic One for carbon rims and Continental for aluminum ones.
Love the Tufo Flexus Cubus ...I rode UP and DOWN what others had to run and almost found an unfair advantage in messy conditions..I could pass on the inside or outside with confidence..and sometimes that makes all the difference.
if you are considering the lower-end (non flexus) tufos, you might also look at the lower end vittorias too - like the tufos - not that supple, but reasonably durable with coated sidewalls. but at the low end tubulars, you can get the same suppleness with tubeless too...worth considering if you're on a budget. lots of tubeless content here in the forums on the CXM website.