rice ratio at $300 w/ something like the V-Moda M100. Since you like an emphasized bass, you do not need the flat/neutral sound signature that audiophiles strive for & spend an exorbitant amount of money to achieve. The next signficant upgrade would be the $1,000 Ultrasone Pro DJ. And the final step after that (IMO) would be the non-portable closed TH-900 $1,500. If you are just looking for a whole new world of bass, there is really no need to go above $300 and you can find really solid options at $100-200. If you want to increase clarity/resolution/sound stage & get that neutral frequency response... that is when you start getting a bit craycray w/ your spendings.
...you do realize that OP was asking about headphones, not in-ears? ...and you do realize the HD800 (list price of $1,500) is nowhere near his budget of $150? I don't really think it's very helpful to throw out recommendations completely 180 degrees unrelated to OP's original post.
for the price, you'll find better sound from over-ears headphones vs. in-ears. why? because in-ears naturally have trouble producing the natural sense of sound stage d/t the fact that they are stuck directly in your ear. $200 over-ears headphones can easily compete w/ $500+ in-ears. The smaller drivers of in-ears also make it hard to have great detailed bass texture & extension. Earbuds that just sit on your ear are no competition for in-ears or over-ears/on-ears because they don't isolate like in-ears or give you the sense of space & detail as larger headphones. There are many great sounding in-ears out there, but you have to spend more to get the same performance as a over-ear. The portability provided by in-ears & their tiny drivers comes at the cost of increasing performance-to-price ratio. That is why most audiophiles here prefer over-ears even when on the go. You really need to go custom in-ears to get the best fit/isolation & sound quality, and those run you $400+.
Luckily for you as a basshead, you can max out the performance
In my personal opinion: To get really great bass, you need your drivers to move enough air to feel that slam & impact... that is really only achievable with over-ear headphones. Also, I sometimes feel like bassy in-ears are often achieved by an EQ-bass-boost of the lower frequencies to compensate for their small drivers rather than a natural deep textured bass with great extension & detail. Personal opinion, of course.
Edit: lol... did you just seriously recommend monsters? there are sooo much better value-for-your-money gear out there......... I kinda can't tell if you are just trolling or being serious.
rice, over ears are much better (esp for bass response). for a basshead, you simply can't get it done w/ in-ears. for sweaty ears, you should go on-ears vs. velour pads. that really helps 
mmm... well, my friend had a pair of monster in-ears... they broke after like 2 months, so I dunno. if you end up gettin em, I would just be careful w/ em.
I mean I would imagine there is a reason that a pair of in-ears lost 75% of it's value in less than 6 months... (and if I was speculating, I would venture something along the lines of ridiculously over-priced to start with & questionable build quality, but you're right I haven't heard them, so I won't make any farther comments about them)
I personally think you can get a lot better stuff for your money, but of course, IMPO/YMMV hahaha
edit: I really couldn't care less what the head-fi community says about any product. A lot of random things get really over-hyped over here. sure, in-ears have their place for their portability, but if you're strictly talking about performance
hahaha & i am actually using bose ie2 on-the-go b/c the wing-tip design is sooo comfy. their sound leaves something to be desired, but that's the trade-off you make when you go for in-ears. i've tried a bunch of different decently high-end in-ears like the s4a, hf5, c5, and a random westone forgot which model & honestly, none of em really did it for me & it's really uncomfortable to have something stuck deep in your ear canal. so yes, my background, I don't really use in-ears for serious music enjoyment. I realized pretty quickly that for me personally that I would need to spend a ton of money to achieve what I was looking for sonically w/ in-ears, so I don't really bother. lol.
