It's a fine bike. Wouldn't change much of anything until you get a season or two of racing under your belt and refine your own equipment preferences. One thing that's important is to have the right tires for the conditions - to keep it simple, Challenge Grifos (the higher end ones with the light sidewalls) are supple and work 90% of the time - probably a good upgrade from whatever's stock on the bike, especially with latex tubes. Miuchelin Mud 2s also good in a variety of conditions.Tire pressure also very important - ask around the parking lot your first few races to see what experienced riders are using for the conditions that day. If you want to spend some more money, wide rims are a nice thing in cross. Revolution 23 WRs are an outstanding race wheel at a reasonable price. If you're already comfortable wwith tubulars, they can't be beat for cross but the wide rim/latex tube/Grifo clincher combo comes close.
Cross racing is less equipment-sensitive vis a vis performance (outside of tire choice) than road racing for a couple of reasons IMHO:
1) Fitness, technical skills and bike handling skills are the primary outcome determinants. A pro level cross bike is probably worth a couple of seconds per lap at most compared to your set-up. Good technical skills on off-camber stuff, flyovers, sand, mud, roots, etc. and picking the right lines add up to a lot more than that. Fitness in cross involves anaerobic bursts superimposed on riding at threshhold most of the rest of the time. This may be different from the endurance-based fitness of triathlon. Work on all this stuff first before going all in on a more expensive bike. In many areas, there's a Wednesday night training race. Ask around.
2)In a muddy (often) race, equipment choices are generally nullified. Your bike can pick up several pounds of mud per lap, rendering a few grams of weight savings meaningless. Drivetrain and wheel friction will primarily be from mud, making the subtle differences between high end and mid-range components trivial again. When you start racing at higher levels, a pit bike (and a friend to pit for you and wash bike between laps) is the solution to this.
Your current bike is pretty nice. There are a multitude of other fine cross bikes out there to consider as you progress. Higher end Cannondales, Ridleys, Van Dessels are common choices among experienced riders, but there are tons of others - cross has become mainstream in the last few years and most major manufacturers have solid choices now. Steel, aluminum, and ti (my favorite) all still work fine for cross if you have a material preference. Carbon dominance isn't fully established yet.
Good luck - it's a blast - jump in and don't sweat the bike choice too much for now.