I agree with everyone who has given you comments on the Heresy's. As a Heresy owner (like a million of them...
), if you cannot afford the new H-III's, H-I's or H-II's will work very well for you. There are two "camps" on the early models, some like H-I's and some like H-II's. Some dislike the H-II's because the woofer is a different model. It's a "taste" thing more so. H-I's are very desirable because they used the same mid and tweeters as the "big boys".... And, because they are birch plywood, they are much easier to repair, re-veneer, etc. As the entry level Heresy for someone on a budget, especially a "tinkerer", the H-I is, in my opinion, the hands down option.
The key to good vintage Heresy sound (including the bass....) is making sure any pair that you obtain are sealed properly (no leaks...), have good capacitors (easily done), and properly placed. While they look like a big "bookshelf" speaker, they are not really intended for that, and should be placed on the floor. I'll confess that I'm the worst offender on placement, but nevertheless, by making sure everything else is done, I've been able to get away with them up high on bookshelves, on top of Klipschorns, etc. Regardless of placement faults, they have always easily held their own with JBL-4311's, 4312's, etc. (Studio/control room monitors).
But..... if you have enough ($700...) and enough space (footprint...), Cornwalls would be the better idea. They are simply better by nature of their design, size, and driver capability (particularly the woofer).
Hope that is of some assistance.
In the kingdom of the blind, the one eyed man is still just the bus driver....