I'm kind of surprised that you feel that the SportsInteraction lines are low. Anyways, to answer your question. You can't go wrong with either 5Dimes or BetJamaica IMHO. Below is a detailed breakdown on what both these fine establishments have to offer you. Which ever book you choose, it's a fine selection.
5Dimes (SBR Rated A) is the way to go for baseball if your a recreational player that bets nickels, and haven't had your limits cut. But just watch out for those delays.
They have no outstanding complaints or processing issues levied against them at this time. Not to mention they offer some pretty good payment solutions for U.S. players (Echecks most notably 300 max./14 day hold). Plus they offer one free fedex payout per month that you will usually get within about 3-5 business days.
The bonus they offer for new customers is a 50% free play with a 5x rollover, and 20% reload bonuses.
They use the ASI software (Which is nice IMO), not to mention the fact that [iSBRFORUM]5Dimes[/iSBRFORUM] has a couple of mirror sites, which helps during the down times:
propbet.com www2.5dimes.com
Did I mention nickel overnight lines (till 8am est), and offers a lot of prop wagering options.
Here is the vig breakdowns 5Dimes, and a few of the other wagering options they have to offer:
.10 up to -176
.15 up to -201
.20 up to -266
.25 up to -280
.30 up to -346
.35 up to -361
.40 up to -386
.45 up to -421
.50 up to -461
Overnight Lines: Yes *See Nickel Lines Chart Below
Reverse Run Lines: Yes
5-inning lines: Yes: RLs, MLs & Totals
Reduced Juice Totals: Yes**
Reduced Juice RLs: Yes**
Grand Salami Totals: Yes
Team Totals: Yes
Overnight Nickel Lines Chart
.05 up to -162
.06 up to -165
.07 up to -193
.08 up to -196
.09 up to -198
.10 up to -251
.11 up to -253
.12 up to -255
.13 up to -257
.14 up to -258
.15 up to -266
.16 up to -270
.17 up to -273
.18 up to -276
.19 up to -278
.20 up to -310
The one complaint I do have against them though. I don't like the fact that they always have problems grading their prop bets. They are notorious for mis-grading those thing and their rules for those seem to have a very gray area IMHOO.
BetJamaica (SBR Rated A+) is more of a recreation book and does offer nice reload bonuses (10 or 20% reup bonuses/$500 max, with a 4x's rollover), however since they are a recreational book they could cut your limits if your chasing steam and or other things of that nature.
Their banking options for U.S. players have actually improved some over the last few months, because they are now offering Echecks (which is very nice feature these days, but info required to be faxed). Not to mention they do free book-to-book transfers ($500 min) with: TheGreek, Legendz, Pinnacle, 5Dimes and BookMaker and soon Wsex (note: Bookmaker will charge you incoming fees).
The payouts are very prompt really for overnight checks (3-5 business days), and the withdraw fees are actually quite reasonable if you exceed the 1 free payout via fedex per calender month (min. $200/$35 flat fee if you exceed the freebie).
Another thing I should make mention of since we have seen some DDos attacks this weekend is that they have a couple of mirror sites for emergency purposes.
They also are now offering an online chat service which is always a nice feature
The lines they offer are very competitive with most other books IMO, and the use a dimeline up to -190 in baseball. Which I feel is great!
Here is the baseball vig breakdown and betting options they will be offering this 2008 baseball season.
.10 up to -190
.13 up to -195
.15 up to -200
.18 up to -205
.20 up to -240
.25 up to -250
.30 up to -280
.35 up to -290
.40 up to -300
.45 up to -310
.50 up to -320
Overnight Lines: Yes
Reverse Run Lines: Yes
5-inning lines: Yes
Reduced Juice Totals: No
Grand Salami Totals: Yes
Team Totals: No