You're not going to get 30bhp N/A without rebuilding the engine to some degree. It's that simple. Anyone that tells you otherwise doesn't have a clue, or is lieing out the yang. Don't trust them farther than you can throw spark plugs at them!
Maybe find the last of the Bosal headers, port & polish the heads, install a piggyback. That'd get some power.
In order on what I would personally do:
Turbo it
50 wet shot - n2o
Buy the Ripp S/C kit
Buy the weak turbo kit.
If you don't use it much I'd do the n2o before the turbo.
The 3s-gte heads swap, the 3s-gte exhaust manifold swaps (Regardless of the heads).
That means you can turbo a 3s-fe/5s-fe fairly easily.
3s-gte exhaust manifold
CT-26 turbo (or drill out an adapter plate for whatever)
intercooler
piping
Save $50 misc things people never remember - T bar clamps (hose clamps can slip over time, but you can normally get away with using them if you're not over-doing it) & connectors.
Downpipe to connect to the stock exhaust.
Most of the cost goes to fuel upgrades.
190lph Walbro
330-390cc injectors (Depending on what you want to try to run)
or add 650-720cc worth of fuel from extra injector<s>
Some piggyback to tune the AFM to run the new fuel injectors - safc, smt, e-manage, ftc1 unichip etc.
That's about it.
Only thing to note is that you're pretty well confined to life under 230bhp on the 5s-fe, and 200bhp on a 3s-fe. Power wise they're not over-built like most Toyota engines - They can't double stock power. :'( )