I'm looking to spend no more than 60, but might be pushed to 70 for the right product. It's not anything I plan on using frequently, just something for occasionally relaxing to. But my main requirement is the bass. Not that thuddy, tinny bass, but deep, surrounding bass, like what the Beats by Dre produce.
I ran your recommendations by my brother - who is a music production enthusiast - and while he claimed the Sennheiser HD380 headsets are complete sh*te (his words), he did say the AKG 452s are really good, so I'll definitely check out some reviews. He also mentioned a brand titled 'Monster'; have you heard of them?
Any half-decent headphone from a premium manufacturer is (or should be) capable of producing bass as good or better than Dres. Dres tend to be very overdriven, which makes the bass flabby rather than crisp, the same way that cheap subwoofers do. I recommended the HD380s purely because they're quite bass-heavy; they're not very well balanced for general listening but suit certain musical styles, like D&B, hardcore, dubstep ect ect quite well because of it.
The AKGs are very balanced and neutral sounding. Bass isn't so much "pounding" as "realistic", which means if you're listening to music that is well produced (I.E a fair bit of electronic music to be honest) they give the impression of being very bassy. Basically they respond well to good production, but a word of warning- they sound utterly sh*t with low-fi recordings or low-quality MP3 tracks. They've got no overdriving or distortion of the sound to disguise poor compression or poor recording.
The Grados are phenomenal but you can't really use them in public because they're open-backed and extremely leaky. Sitting next to someone wearing Grados is like sitting next to someone playing music on a mid 2000s Nokia, they leak so badly. Absolutely amazing headphones, but solely for home audio consumption unless you want people punching you on trains.
I've only heard of Monster in the context of selling overpriced cables to gullible fools. Never knew they made headphones too.