expansion sounds on laptop for live playing

[TB4C]

Hi Everyone,

I just got a Hp 360X laptop that i want to use a "sound module" with my synths.

here are the specs

win 8.1

i3 @ 1.9 ghz
4gb ram
750gb hdd

the synths i have are Diva, Sylenth, Synthmaster, Vanguard, Ace, Dune1 and the korg legacy synths. Which Synths do you recommend i can use for nice pads, synth bass, leads in additional to the Piano and Electric piano I use in my band setup that the touch laptop will cope with? I want to bring a "modern" sound to my band

which free vst host do you recommend for live playing? Or can i use my spare Sonar 8 pro as a host for stacking and live playing? Is there any other efficient free host, i dont have a external sound card will the onboard one do?

Thank you for the replies,

Regards