If you haven't ordered a rod yet...
The Extreme series for bottom contact baits is a very nice step up, and in my opinion a must. I don't want to wonder what else I could be feeling, or what I'm missing, if you can afford it, or save up for another month then afford it, you won't regret it.
IF YOU CANT afford it... Why not a 734 Champion? If you like the 7'4 5 Power Extreme, the 734 Champion is not a bad compromise.
Some things to consider... The 745DX isn't a "true" 5 power rod like a 765 Flipping Stick, and it's even a bit lighter in power than the 735 Champion..
The 784ML Jig Rod also, is light in the tip... The 744DX and 745DX have a bit stiffer of a tip than the 784ML, BUT the added length is an advantage with casting distance and moving line on the hookset (I like this rod the best for dragging stuff .. football jigs, c-rigs, football heads with grubs, etc..)
The 745DX I use for the same football jigs and such, but I also use it to cast jigs and use it for shallower jig fishing (docks or pitching to specific spots).
If you're on a budget and really liked the 745DX, I'd go 734 Champion (great ALL around rod, spinnerbaits, chatterbaits, spooks, buzzbaits, etc). If you can afford it and you really liked it, the 744 and 745 are GREAT rods, slightly more power than the 784ML.
Ultimately comes down to personal preference, and exactly what you plan to use it for. Personally seeing you want it for 1/4oz an 3/8oz jigs, the 744 DX is probably the way to go, or even the 784ML (my rod of choice for dragging 1/4oz and 3/8oz football jigs). The 744 though is a better ALL around rod, spinnerbaits, buzzbaits, etc if you want. Depending on budget and YOUR specific desire, sounds like 734 or 744 depending on what you want to spend.