advice on rack 1 add for an balanced rack.. or not !

hi, 

i am interesting in the starter rack 1.. but thinking to go in 20x1 rack and adding things..  
yes, 1 line rack for limit and learn slowly......
but...
i use a few vcv, elektron gear, dreadbox gear too, i play music for myself like therapy/weekend/loose my mine in space..

and want try to go on modular for an other place standalone system.. looking fun place..
so i am a newbie and not in the same time...

i love how Sawvox sound on demo, is it a good idea if i replace VCO by this ?
(and no idea if is it possible to repace something on starter rack..)

i think add 4 i/o too, i am a owner of a korg sq-1 for sequencing and i have different pedal effect

but...

i love solina, multi fx, ms 20 filter too.. ok wavetables is nice too..
but.. maybe adding all of this is not a good idea for begin...

advice about this ?

or just add solina and multifx with ?? (just try to found a balances rack 1+)

i am interesting in the sea of drone/experiment/ambient thing.. 


or forget all, save your bucket and go on starter rack 2 for begin, add 4 i/o if want and comeback in 6 months !!


thank you for your help and time..
i have time to take decision, i don’t have all the money i need but it is on the way..