I'm certainly no expert, but this is my take: an HP D30 is fairly close to a TJ D44. If you're fine with gearing only as low as 4.88, then the HP D30 may be fine for 37s locked, but I'd guess it may be close to it's limit. That said, people like Imped and a few I wheel with have HP D30s and are very happy with them even after beating them hard, however they're only on 35s. If you're serious about 37s you may need something a bit bigger. Originally I was going to run one myself, but I've got the 42RLE tranny in my '04 which means I'm looking at gearing lower than 4.88; because of this, I'll be looking for something other than an HP D30.
If you decide you want more strength, the JK HP D44 seems to be a very good axle. Blaine from Black Magic Brakes and Savvy is/has building/built one, and I believe he was very impressed with it's strength. JeepForum is down right now otherwise I would link the thread, but once it's back up I'll try and remember to post it over here. When I get around to upgrading my front axle, I believe I may try and find one to build up. Whether it's more up to the task of 37s or not I'm not 100% sure as its been a while since I've read that thread.