I don"t want to go down the obvious Shallis/Auckland/Bedi route, but I do believe that these events are very similar to the Grand National and the best bet is each-way on those who have survived the course before.
On that basis, my three to watch in Cardiff are:
Anthony Williams
Mark Redshaw
Colin O"Prey
However, once he gets on or close to the final table, Mark will bust himself out by going all-in with 3 4 or 4 5, same as he did in Dublin & Walsall!