Just a note on how to cut $1000 out of the rack: there's a little math trick that helps with this quite a bit. Simply divide the price of a given module by its width in hp. That resulting number is the 'price per hp', and the lower you can make that per each function you want, the cheaper the build gets...pretty quick, in fact.
For instance, let's take TZFM VCOs. Scrolling through the VCOs, we come across:
Cynthia Zeroscillator: $1195 @ 36 hp.
Eowave Orage: $185 @ 10 hp.
Schippmann CS-8 Omega-Phi: $1159 @ 24 hp.
Doepfer A-110-6: $250 @ 12 hp.
Dannysound EN129: $239 @ 12 hp.
Intellijel Rubicon II: $399 @ 20 hp.
Hexinverter Mindphaser: $599 @ 30 hp.
Harvestman Hertz Donut Mkii: $475 @ 17 hp.
OK...from this, the choice seems like the Eowave, right? Lowest price...but...
Zeroscillator: 33.19
Orage: 18.50
CS-8: 48.29
A-110-6: 20.83
EN129: 19.91
Rubicon II: 19.95
Mindphaser: 19.96
Hertz Donut: 27.94
Those are dollar costs per hp covered by each module. Now, the Eowave still comes out ahead...but using this method to compare, it doesn't do so by much. Fact is, it's the bottom number in a cluster of price-per-hps centered around $19.50. So then the question becomes: how many functions/uses can you get for each different module? And the Eowave is pretty minimally featured, designed more to be used in a group of other VCOs than as a sole standalone. The EN129 is a bit better, but it's a kit and if you're not kit-savvy, it's not an option because having it built will add to the cost overall. That pares your sensible choices down to the Rubicon II, the Mindphaser, and the A-110-6, and you'll notice only a penny's difference in the price-per-hp of the first two. So...which one suits you better?
That's how I settle a lot of module vs. price conflicts. And sometimes, you get surprised. Let's take another example from your build: the reverb, which you're wondering about. Here's five:
2hp Verb: $109 @ 2 hp = $54.50.
Intellijel Springray II: $239 @ 10 hp = $23.90
MakeNoise Erbe-verb: $489 @ 20 hp = $24.45
Purrtronics Purrvrrb: $130 @ 8 hp = $16.25
Doepfer A-199: $180 @ 8 hp = $22.50
Ohhhh SNAP! In this case, the choice certainly ISN'T the 2hp module! Mind you, their stuff is awesome if you have a gap that you'd rather fill with a function instead of a blank...that's a huge strong point for their stuff...but if you have space for something bigger, then no and HELL no. And with the glaringly-obvious price-per-hp advantage, you should be looking at the Purrvrrb instead.
Anyway, that's just another tool to work with...but I've found that it's a damn useful one for whittling down choices or, in cases such as the reverbs above, finding the best cost-effective solution. Give it a try!