[RWP] need some VST recommendations

[hadi]

hello there

i've recently started to use reaper and i can say it's very cool, i 
can't be more faster than this :)

i mostly work with hardware synths, but i'm going to give some software 
instruments a try too.
can you recommend me some good VST, (both commercial and free), which 
has accessible interface as well?
i tried to download and try some of the freewares and they had an 
inaccessible graphical interface.

i'd appreciate any help.
thanks alot!
-regards,
hadi