If you are willing to use a mid cue extension, suddenly every cue you see for sale is now something that will fit you. The cues you thought were too light (<19oz) and the cues short by 1/2" no longer matter: you can just slap a 4"-6" mid cue extension on the cue, and suddenly the cue will be heavier and more forward balanced (desirable in my opinion). The one issue that will remain is: grip size. With a mid cue extension, you will probably slide your hand forward 3"-5", and you will grip the cue where the butt has tapered to something narrower than the diameter at the end of the butt (where you are probably gripping a 58" cue now). If you don't care about butt diameter, then a mid cue extension is all you need. They typically cost less than $100.
If you have big hands, you might like a fatter diameter butt, and there aren't many choices available. Almost all production and custom cues are constructed with butt diameters less than 1.25" at the end of the butt, and sliding your hand forward will mean the grip area will be even skinnier. Most custom cue makers won't even make cues with old style 1.29"-1.30" diameter butts, although it so happens there are a couple of cues with fat diameter butts currently listed in the For Sale forum:
Custom Merry Widow new cue for sale. Highly figured Bocote Prong and Butt Sleeve. Mahogany Handle. 3/8-10 joint pin. Holly Butt Cap. Ivory substitute joint. Butt weighs 14.77 oz. Shaft weighs 3.38 oz with Deer Antler 12.8 mm Ferrule and LePro tip. Deer Antler and Ivory ferrules hit the best...
forums.azbilliards.com
(the other one sold)
For production cues, I think your only choice for a fatter butt is Viking, where the standard butt size is 1.295". Viking also sells mid cue extensions.
You should be able to find a custom cue maker that will make you a 60" custom merry widow for under $1k. However, I think ordering a 58" cue with a mid cue extension to get an even longer cue is a better option. Viking does sell 31" shafts, so you could pair a 31" shaft with one of their 29" butts to get a 60" cue.
Check out Shortstop On Pool's video describing what he thinks is the proper cue length for tall players.
My 58" cue has a 4" mid cue extension (1.25oz), and I think it's great. I want to try a 6" mid cue extension. I also have an 8" rear extension (3 oz), and my favorite configuration is playing with both the mid cue extension and the rear extension on all shots, for a total length of 70".