Before dumping Mystery Goo into the engine, set the valves.
IMO, there is no need for any additives unless you see signs of sludge. (Varnish is harmless, gunky deposits are the worry.) Even if there is light sludge, I'd prefer using a synthetic (whichever is on sale) to clean the engine. If then engine is already fairly clean, leave it alone and run any decent oil and a good filter. Syn is nice for cleaning and longer change intervals, but it dino juice will protect just as well.
IMO, avoid the cheapo filters. Spend another $3 and get a solid mid-range unit. Purolator/PureOne, Bosch, Wix, and several others are well build and will cost somewhere around 6~7 bucks. M1, K/N, Royal Purple and other $10+ filers are all very well built, but are not really necessary.
Don't bet on the engine using much oil. My 92 Accord with almost 200K burns less then one qt. per 10K.
As mentioned, the valves are a cinch to tweak.
Other things to look for include:
Check the spark plug tubes for seepage. Depending upon the design of your engine, there will be one or two sets of o-rings that seal the plug tubes off from the valve area. The upper set are easy to change, and you might wish to do so when you're checking the valve lash.
Ball joint and steering rack grease boots will be cracking by now. If cracked, these need to be replaced to avoid expensive repairs down the road. Dry ball lower joints will eventually fail, causing the wheel will fall off!
http://www.tegger.com/hondafaq/lowerballjoint/index.html
Suspension bushings may be cracking. Aftermarket urethane replacements are easy to install and work well.
Check the ancillary coolant hoses. The small buggers that run behind the engine will be getting brittle by now. Check to be sure that none are rubbing on something they shouldn't be.
Enjoy your ride!