what wheels to buy

hi i am looking for advice on wheels for triathlon,i have training wheels so these will be race wheels ,i am 66/67kgs and have a cervelo p2ksl,which i am very happy with,in looking tru forum i notice some people prefering clincher wheels for time trial is this the feeling out there or am i picking it up wrong,
i have beeing looking at mavic cosmic carbone i know they are heavy on spec but some of they reveiws i read look good once they are not for climbing
what do people think of these wheels compared to similar price wheels zipp 404 etc.
also if buying a disc wheel again what do people think of clincher/ tubular and also what wheel would people advice.i notice hedd superlight to be very reasonably priced and also corima disc how do these compare with the likes of pro/zipp and mavic disk and how much difference will the fact that corima is not lenticular but flat make on clock.
thanks for time cheers