Ok, two further questions:
Do you jump to a location or do you want the aquired target to be a unit that can move around freely and your jump being adjusted to that (I know, a 'little' unrealistic ^^)?
In addition: if the latter should be the case, would you want a max range to jump? E.g. it would be pretty funny (and deadly) if the target is teleporting away and you jump through the whole map into the opposing fountain area or such
Another thing bothering me would be in that case, that max ms is 522... so basically the target could under circumstances move faster than your jumper..?
Apart from that, I try to recollect what I've understood so far (please correct me if I'm wrong):
-caster jumps towards a target
-affects only himself, triggered by target aquisition
-usual range (or if you jump to location of unit a max range) of 800.
-you cannot target this spell on the ground, you MUST target a unit.
-legal targets are enemy units
-damage is done foes only in range, not caster himself or allies
-jumping unit is invulnerable during jump time (since removing invulnerability causes some problems ingame with lasting effects, as far as I recall, I'd use magic immunity + temporary extreme high armour instead?)
If you would take your time to answer these questions, I'm confident I could make you a test map during the next few days (stuck with learning for uni atm -> not much time today -.-).