I wouldn't mess with a drop in at that level. No room to grow. I have a qssb with AC's and couldn't be happier. 38psi pretty easy and cleans them pretty well. Don't think you can go wrong with either at sea level. The s300/400 may be better for modding later but I don't have any experience personally so I won't say. Stock H2e or Qssb are both maxed over stage 2's but are often pushed over that but it depends on other factors and goals. Altitude, trans, towing, pulling, dd, tuning, and taste all determine which turbo will make you happy. Will a stocker work, yes, will a sledgehammer work, yes. Stock H2e or qssb is more of a question of stick or auto and how fast you think the turbo should spool. I drove a truck similar to mine except s2's and bb and spool was the same as mine AC and qssb. Your call. I like mine and couldn't be happier but I you won't be dissapointed with h2e either.
The QSSB with a kit from Carlson would be my choice. You then have room to grow. You can upgrade to the GQSSB which will given you enough flow for mid 500's+ with the correct other upgrades. The upgrade to the gqssb is a perfect match for 238/259 hybrids when you are ready. The qssb is very well matched to your stage II's you have now. Give Zane at WOP a call.
the h2e and the qssb are both good turbos from what i hear and if ever needed both can be moded if you decide to grow. vs the 2, i cant say because i havent run either one of them but alot of guys like their moded h2e and i believe the qssb is a step up from a standered h2e.
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Thanks guys for all the input. I think im going with an S300 in a 66mm trim. I need something I can throw 250cc hybrids at soon. Going to run my stage 2's for a bit till I can afford to turn my stock injectors into hybrids.