In chronological order - I own;
x3 JRX2 - x3 (plus poss enough parts to build a 4th)
x1 JRX Pro
x1 JRX Pro SE (to be re-built with a retro-fit XX gearbox)
x3/4 Double Xs - 1x Kinwald, 1x original NIB base model kit, 1x full option graphite car (current in parts) - + enough bits to build 1, poss 2 more!
x XXT Graphite +
x1 Original edition XXX
x1 Atomic Carbon XXXCR2 with PSI 4-gear box (poss soon to find a new owner)
Most bases covered in terms of the 2wd buggies from Losi - though I'm missing a Jr2 & haven't got into the 22 series. Would love a XX4 though to add to the collection