i built my own power pack 
2 SLA golf buggy batteries in a lowepro nova 200 AW bag with a 1000W pure sign wave inverter and a power board. modified a set of jumper leads to wire it all upused decent quality auto terminals and electrical heat shrink to make it neat and tidy, good for a couple of hundred pops of 2 flashes at full power, cost about $400 including a trickle charger to keep the batteries full and healthy when not being used.
That's awesome. Sent you a PM 
Has anyone tried one of these Tronix Explorer XT battery packs before? They're supposedly good for 400-480 pops at 500ws.
www.innovatronix.com/index.php/webshop/portable-battery-packs/tronix-explorer-xt-se-115v-60hz-detail
http://www.robgalbraith.com/bins/content_page.asp?cid=7-6468-7843 I know it's a bit dated, but you might find it useful. actually, there is some more current info on his site, just search for "tronix".
I've read over all that Elinchrom info and I don't see it written anywhere that it can do any sort of HSS stuff. With the way things are changing i wouldn't say it can't be done, but i don't see this kit doing it. actually the info for this stuff reads that the monolight can go as fast as 1/320th on enabled cameras. i don't know what enabled cameras means, i'd have to track that down. but then the trigger reads it will go to 1/250th so with that trigger anyway you are stuck a 1/250th.
- BTW-my odins work just fine with my 5d, 5dmk3. fine... no, they are awesome, i should have gotten them earlier.