Agent vs. Direct Submission

I've just finished a first draft of a 60k word erotic romance novel, with BDSM themes. I set it down for a couple of weeks and then came back to it to start editing. I'm wondering if I can get some opinions on whether it would be better to try to get an agent or to submit it directly to a publisher.

Three publishers I am interested in pursuing are Loose Id, Ellora's Cave and Samhain, mostly because I have read a lot of their books and feel my work fits in well with what they offer. I notice they take authors without agents quite frequently.

I was also interested in Harlequin Spice, but thought I might need an agent for them.

Any thoughts or experiences you can share would be appreciated.

Thanks!

Thank you. I kind of suspected due to the variety of work available in this genre. I guess, I was worried going unagented might mean my work would get lost in the shuffle of all the other similar novels out there. I know everyone thinks their work is a precious snowflakem and I'm no different. But I guess promotion is a different question for a different thread. I'm certainly getting ahead of myself.
Thank you for your reply kuwisdelu!