According to Cheeky's and factoring in my latency, the Crossbow of Relentless Strikes sans the new 2h axe is a decent DPS upgrade running the 3:2, but if I get the axe I'll have to do 1:1 (if the spreadsheet is right, see below) and the increase is modest at best.
But it also says running 1:1 with Don Santos is slightly more DPS than running 3:2, and I'm a bit skeptical of that outcome based on comments here and at tkasomething.com. So it would be best for me (or anyone else in a similar situation, i.e. latency of 100-200ms) to run tests on Dr. Boom with the new xbow before picking up the 2h axe to see if you'll benefit from that haste. I will, but only marginally, meaning I'll stick with S3 for awhile and put those 150 badges in other items.
Having said all that, I'm looking to get the xbow, pants, chest (hoping to get a Magister's Terrace chest until I can afford the badge version) or ring... and once I get those I'll reevaluate my needs. Unfortunately I only stacked 150 badges before today so I have some work to do before I can afford the other pieces (I know nothing is available yet, I'm just saying).