Bob,
Just did some research that pertains to your question. The VS 250 has a retrieve ratio of 4.25:1 and pulls in 35.5 inches of line per turn of the crank handle. The VS 250 is similar in spool size to your 704Z Penn, but the Penn has a retrieve ratio that is slower at 3.8:1.
The VS 300 has a retrieve ratio of 3.25:1 and pulls in 30 inches of line per turn of the handle. The 706Z has the same size spool as the VS 300 in diameter but is also 3.8:1.
The Saltiga SA-Z4500 has a 4.9:1 retrive ratio and by the looks of the small spool capacity 140yds of 20# mono is either very small in diameter or very shallow.
There are two major points here: How fast will you be able to retrieve a lure, and when the need for power/torque is needed will you have enough "juice" to bring the fish in (large fish or ripping current with a medium size fish). Obviously it is a compromise. This topic comes up alot with the cape cod canal guys, due to the horrendous currents and sticky jig eating bottom they have to deal with.
I'll pass this on to you here, Jack Yee said,"give me a 704Z Penn and I'll pull any size fish out of Montauk waters". He is a conventional guy all the way (Abu Big Game 7000cl).
Save your money 700 clams is alot for a reel that just shouts my bank book just took a hit. Your Penns and Shimanos, will get it done and then some. Case in point the world record Bass 78# was caught on a Penn 710Z with 20# Mono and an 8' Rod. How does that saying go? "Like what you need, and need what you have"
Speak to you soon, good luck,
Steve
