the 7200 uses a 50mm fork... but built around a 700c wheel... so the best thing you can do is take the tape measure from the axle to crown (about where the bike head tube starts) once you know that measurement you can look at the fork that is close...

for reference... a fork 20mm shorter will steepen the head angle by about 1* and lower the BB by about 7mm

as for the fork with a lockout... a lockout is NOT a replacement for a rigid fork... my tora has one... it still compresses just a limited amount, it is a lot stiffer... but honestly... why have a shock just to lock it out... even a used fork like that will cost a lot more then a rigid...

it's one of the compromises we clyds have... we need beefy eqipment... that includes the fork... unfortuantly the budget forks don't meet our needs outside of very light recreational riding... just part of the cost...