mentor memory gel or mentor memory gel xtra i weigh 8 stone im 5ft 4 and size 8 in clothes.i am currently a 34aa cup and hoping to achieve a full c.i have been offered 300cc moderate profile mentor memory gel or if i go for the memory gel xtra mod plus she could fit in a 335 cc.ive not heard much about the memory gel xtra and very uncertain of which to chose?"